diff --git a/lib/Github/Api/PullRequest.php b/lib/Github/Api/PullRequest.php
index b7df369b99d..52cc77fe348 100644
--- a/lib/Github/Api/PullRequest.php
+++ b/lib/Github/Api/PullRequest.php
@@ -3,6 +3,7 @@
 namespace Github\Api;
 
 use Github\Api\PullRequest\Comments;
+use Github\Api\PullRequest\Review;
 use Github\Exception\MissingArgumentException;
 
 /**
@@ -65,6 +66,11 @@ public function comments()
         return new Comments($this->client);
     }
 
+    public function reviews()
+    {
+        return new Review($this->client);
+    }
+
     /**
      * Create a pull request.
      *
diff --git a/lib/Github/Api/PullRequest/Comments.php b/lib/Github/Api/PullRequest/Comments.php
index 971f38cee9e..b2de809ed7a 100644
--- a/lib/Github/Api/PullRequest/Comments.php
+++ b/lib/Github/Api/PullRequest/Comments.php
@@ -11,9 +11,13 @@
  */
 class Comments extends AbstractApi
 {
-    public function all($username, $repository, $pullRequest)
+    public function all($username, $repository, $pullRequest = null)
     {
-        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.rawurlencode($pullRequest).'/comments');
+        if (null !== $pullRequest) {
+            return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.rawurlencode($pullRequest).'/comments');
+        }
+
+        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/comments');
     }
 
     public function show($username, $repository, $comment)
diff --git a/lib/Github/Api/PullRequest/Review.php b/lib/Github/Api/PullRequest/Review.php
new file mode 100644
index 00000000000..8977bddf8dd
--- /dev/null
+++ b/lib/Github/Api/PullRequest/Review.php
@@ -0,0 +1,161 @@
+<?php
+
+namespace Github\Api\PullRequest;
+
+use Github\Api\AbstractApi;
+use Github\Exception\InvalidArgumentException;
+use Github\Exception\MissingArgumentException;
+
+/**
+ * API for accessing Pull Request Reviews from your Git/Github repositories.
+ *
+ * @link https://developer.github.com/v3/pulls/reviews/
+ * @author Christian Flothmann <christian.flothmann@sensiolabs.de>
+ */
+class Review extends AbstractApi
+{
+    /**
+     * Get a listing of a pull request's reviews by the username, repository and pull request number.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#list-reviews-on-a-pull-request
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param array  $params      a list of extra parameters.
+     *
+     * @return array array of pull request reviews for the pull request
+     */
+    public function all($username, $repository, $pullRequest, array $params = [])
+    {
+        $parameters = array_merge([
+            'page' => 1,
+            'per_page' => 30
+        ], $params);
+
+        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews', $parameters);
+    }
+
+    /**
+     * Get a single pull request review by the username, repository, pull request number and the review id.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#get-a-single-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param int    $id          the review id
+     *
+     * @return array the pull request review
+     */
+    public function show($username, $repository, $pullRequest, $id)
+    {
+        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews/'.$id);
+    }
+
+    /**
+     * Delete a single pull request review by the username, repository, pull request number and the review id.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#delete-a-pending-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param int    $id          the review id
+     *
+     * @return array|string
+     */
+    public function remove($username, $repository, $pullRequest, $id)
+    {
+        return $this->delete('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews/'.$id);
+    }
+
+    /**
+     * Get comments for a single pull request review.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#get-comments-for-a-single-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param int    $id          the review id
+     *
+     * @return array|string
+     */
+    public function comments($username, $repository, $pullRequest, $id)
+    {
+        return $this->get('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.rawurlencode($pullRequest).'/reviews/'.rawurlencode($id).'/comments');
+    }
+
+    /**
+     * Create a pull request review by the username, repository and pull request number.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#create-a-pull-request-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param array  $params      a list of extra parameters.
+     *
+     * @throws MissingArgumentException
+     *
+     * @return array the pull request review
+     */
+    public function create($username, $repository, $pullRequest, array $params = [])
+    {
+        if (!isset($params['event'])) {
+            throw new MissingArgumentException('event');
+        }
+
+        if (!in_array($params['event'], ["APPROVE", "REQUEST_CHANGES", "COMMENT"], true)) {
+            throw new InvalidArgumentException(sprintf('"event" must be one of ["APPROVE", "REQUEST_CHANGES", "COMMENT"] ("%s" given).', $params['event']));
+        }
+
+        return $this->post('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews', $params);
+    }
+
+    /**
+     * Submit a pull request review by the username, repository, pull request number and the review id.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#submit-a-pull-request-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param int    $id          the review id
+     * @param array  $params      a list of extra parameters.
+     *
+     * @throws MissingArgumentException
+     *
+     * @return array the pull request review
+     */
+    public function submit($username, $repository, $pullRequest, $id, array $params = [])
+    {
+        if (!isset($params['event'])) {
+            throw new MissingArgumentException('event');
+        }
+
+        if (!in_array($params['event'], ["APPROVE", "REQUEST_CHANGES", "COMMENT"], true)) {
+            throw new InvalidArgumentException(sprintf('"event" must be one of ["APPROVE", "REQUEST_CHANGES", "COMMENT"] ("%s" given).', $params['event']));
+        }
+
+        return $this->post('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews/'.$id.'/events', $params);
+    }
+
+    /**
+     * Dismiss a pull request review by the username, repository, pull request number and the review id.
+     *
+     * @link https://developer.github.com/v3/pulls/reviews/#dismiss-a-pull-request-review
+     *
+     * @param string $username    the username
+     * @param string $repository  the repository
+     * @param int    $pullRequest the pull request number
+     * @param int    $id          the review id
+     *
+     * @return array|string
+     */
+    public function dismiss($username, $repository, $pullRequest, $id)
+    {
+        return $this->put('/repos/'.rawurlencode($username).'/'.rawurlencode($repository).'/pulls/'.$pullRequest.'/reviews/'.$id.'/dismissals');
+    }
+}
diff --git a/lib/Github/Client.php b/lib/Github/Client.php
index eb7f3e727dd..af0cf58efab 100644
--- a/lib/Github/Client.php
+++ b/lib/Github/Client.php
@@ -127,7 +127,7 @@ public function __construct(Builder $httpClientBuilder = null, $apiVersion = nul
         )));
 
         $this->apiVersion = $apiVersion ?: 'v3';
-        $builder->addHeaders(['Accept' => sprintf('application/vnd.github.%s+json', $this->apiVersion)]);
+        $builder->addHeaderValue('Accept', sprintf('application/vnd.github.%s+json', $this->apiVersion));
 
         if ($enterpriseUrl) {
             $this->setEnterpriseUrl($enterpriseUrl);
diff --git a/lib/Github/HttpClient/Builder.php b/lib/Github/HttpClient/Builder.php
index f67c2c9dd08..7d2052498e6 100644
--- a/lib/Github/HttpClient/Builder.php
+++ b/lib/Github/HttpClient/Builder.php
@@ -157,6 +157,19 @@ public function addHeaders(array $headers)
         $this->addPlugin(new Plugin\HeaderAppendPlugin($this->headers));
     }
 
+    /**
+     * @param string $header
+     * @param string $headerValue
+     */
+    public function addHeaderValue($header, $headerValue)
+    {
+        if (!isset($this->headers[$header])) {
+            $this->headers[$header] = $headerValue;
+        } else {
+            $this->headers[$header] = array_merge((array)$this->headers[$header], array($headerValue));
+        }
+    }
+
     /**
      * Add a cache plugin to cache responses locally.
      *
diff --git a/test/Github/Tests/Api/PullRequest/CommentsTest.php b/test/Github/Tests/Api/PullRequest/CommentsTest.php
new file mode 100644
index 00000000000..a6213a168cc
--- /dev/null
+++ b/test/Github/Tests/Api/PullRequest/CommentsTest.php
@@ -0,0 +1,495 @@
+<?php
+
+namespace Github\Tests\Api\PullRequest;
+
+use Github\Api\PullRequest\Comments;
+use Github\Api\PullRequest\ReviewComment;
+use Github\Tests\Api\TestCase;
+
+class CommentsTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function shouldGetAllReviewCommentsForAPullRequest()
+    {
+        $expectedValue = [
+                [
+                'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                'id' => 1,
+                'pull_request_review_id' => 42,
+                'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+                'path' => 'file1.txt',
+                'position' => 1,
+                'original_position' => 4,
+                'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+                'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+                'user' => [
+                    'login' => 'octocat',
+                    'id' => 1,
+                    'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                    'gravatar_id' => '',
+                    'url' => 'https://api.github.com/users/octocat',
+                    'html_url' => 'https://github.com/octocat',
+                    'followers_url' => 'https://api.github.com/users/octocat/followers',
+                    'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                    'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                    'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                    'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                    'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                    'repos_url' => 'https://api.github.com/users/octocat/repos',
+                    'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                    'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                    'type' => 'User',
+                    'site_admin' => false,
+                ],
+                'body' => 'Great stuff',
+                'created_at' => '2011-04-14T16:00:49Z',
+                'updated_at' => '2011-04-14T16:00:49Z',
+                'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                '_links' => [
+                    'self' => [
+                        'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                    ],
+                    'html' => [
+                        'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                    ],
+                    'pull_request' => [
+                        'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                    ],
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/12/comments')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->all('octocat', 'Hello-World', 12));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldGetAllReviewComments()
+    {
+        $expectedValue = [
+            [
+                'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                'id' => 1,
+                'pull_request_review_id' => 42,
+                'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+                'path' => 'file1.txt',
+                'position' => 1,
+                'original_position' => 4,
+                'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+                'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+                'user' => [
+                    'login' => 'octocat',
+                    'id' => 1,
+                    'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                    'gravatar_id' => '',
+                    'url' => 'https://api.github.com/users/octocat',
+                    'html_url' => 'https://github.com/octocat',
+                    'followers_url' => 'https://api.github.com/users/octocat/followers',
+                    'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                    'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                    'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                    'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                    'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                    'repos_url' => 'https://api.github.com/users/octocat/repos',
+                    'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                    'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                    'type' => 'User',
+                    'site_admin' => false,
+                ],
+                'body' => 'Great stuff',
+                'created_at' => '2011-04-14T16:00:49Z',
+                'updated_at' => '2011-04-14T16:00:49Z',
+                'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                '_links' => [
+                    'self' => [
+                        'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                    ],
+                    'html' => [
+                        'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                    ],
+                    'pull_request' => [
+                        'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                    ],
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/comments')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->all('octocat', 'Hello-World'));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldShowReviewComment()
+    {
+        $expectedValue = [
+            'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+            'id' => 1,
+            'pull_request_review_id' => 42,
+            'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+            'path' => 'file1.txt',
+            'position' => 1,
+            'original_position' => 4,
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false,
+            ],
+            'body' => 'Great stuff',
+            'created_at' => '2011-04-14T16:00:49Z',
+            'updated_at' => '2011-04-14T16:00:49Z',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+            '_links' => [
+                'self' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                ],
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/comments/1')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->show('octocat', 'Hello-World', 1));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldCreateReviewComment()
+    {
+        $expectedValue = [
+            'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+            'id' => 1,
+            'pull_request_review_id' => 42,
+            'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+            'path' => 'file1.txt',
+            'position' => 1,
+            'original_position' => 4,
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false,
+            ],
+            'body' => 'Great stuff',
+            'created_at' => '2011-04-14T16:00:49Z',
+            'updated_at' => '2011-04-14T16:00:49Z',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+            '_links' => [
+                'self' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                ],
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                ],
+            ],
+        ];
+        $data = [
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'path' => 'file1.txt',
+            'position' => 4,
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('post')
+            ->with('/repos/octocat/Hello-World/pulls/1/comments', $data)
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->create('octocat', 'Hello-World', 1, $data));
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotCreateReviewCommentWithoutCommitId()
+    {
+        $data = [
+            'path' => 'file1.txt',
+            'position' => 4,
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 1, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotCreateReviewCommentWithoutPath()
+    {
+        $data = [
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'position' => 4,
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 1, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotCreateReviewCommentWithoutPosition()
+    {
+        $data = [
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'path' => 'file1.txt',
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 1, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotCreateReviewCommentWithoutBody()
+    {
+        $data = [
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'path' => 'file1.txt',
+            'position' => 4,
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 1, $data);
+    }
+
+    /**
+     * @test
+     */
+    public function shouldUpdateReviewComment()
+    {
+        $expectedValue = [
+            'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+            'id' => 1,
+            'pull_request_review_id' => 42,
+            'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+            'path' => 'file1.txt',
+            'position' => 1,
+            'original_position' => 4,
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false,
+            ],
+            'body' => 'Great stuff',
+            'created_at' => '2011-04-14T16:00:49Z',
+            'updated_at' => '2011-04-14T16:00:49Z',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+            '_links' => [
+                'self' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                ],
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                ],
+            ],
+        ];
+        $data = [
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('patch')
+            ->with('/repos/octocat/Hello-World/pulls/comments/1', $data)
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->update('octocat', 'Hello-World', 1, $data));
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotUpdateReviewCommentWithoutBody()
+    {
+        $expectedValue = [
+            'url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+            'id' => 1,
+            'pull_request_review_id' => 42,
+            'diff_hunk' => '@@ -16,33 +16,40 @@ public class Connection  => IConnection...',
+            'path' => 'file1.txt',
+            'position' => 1,
+            'original_position' => 4,
+            'commit_id' => '6dcb09b5b57875f334f61aebed695e2e4193db5e',
+            'original_commit_id' => '9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840',
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following[/other_user]',
+                'gists_url' => 'https://api.github.com/users/octocat/gists[/gist_id]',
+                'starred_url' => 'https://api.github.com/users/octocat/starred[/owner][/repo]',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events[/privacy]',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false,
+            ],
+            'body' => 'Great stuff',
+            'created_at' => '2011-04-14T16:00:49Z',
+            'updated_at' => '2011-04-14T16:00:49Z',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+            '_links' => [
+                'self' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/comments/1',
+                ],
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/1#discussion-diff-1',
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/1',
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api->expects($this->never())
+            ->method('patch')
+        ;
+
+        $this->assertSame($expectedValue, $api->update('octocat', 'Hello-World', 1, []));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldDeleteReviewComment()
+    {
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('delete')
+            ->with('/repos/octocat/Hello-World/pulls/comments/1')
+        ;
+
+        $api->remove('octocat', 'Hello-World', 1);
+    }
+
+    protected function getApiClass()
+    {
+        return Comments::class;
+    }
+}
diff --git a/test/Github/Tests/Api/PullRequest/ReviewTest.php b/test/Github/Tests/Api/PullRequest/ReviewTest.php
new file mode 100644
index 00000000000..54b8d55aafe
--- /dev/null
+++ b/test/Github/Tests/Api/PullRequest/ReviewTest.php
@@ -0,0 +1,401 @@
+<?php
+
+namespace Github\Tests\Api\PullRequest;
+
+use Github\Api\PullRequest\Comments;
+use Github\Api\PullRequest\Review;
+use Github\Tests\Api\TestCase;
+
+class ReviewTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function shouldGetAllReviewsForAPullRequest()
+    {
+        $expectedValue = [
+            [
+                'id' => 80,
+                'user' => [
+                    'login' => 'octocat',
+                    'id' => 1,
+                    'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                    'gravatar_id' => '',
+                    'url' => 'https://api.github.com/users/octocat',
+                    'html_url' => 'https://github.com/octocat',
+                    'followers_url' => 'https://api.github.com/users/octocat/followers',
+                    'following_url' => 'https://api.github.com/users/octocat/following{/other_user}',
+                    'gists_url' => 'https://api.github.com/users/octocat/gists{/gist_id}',
+                    'starred_url' => 'https://api.github.com/users/octocat/starred{/owner}{/repo}',
+                    'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                    'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                    'repos_url' => 'https://api.github.com/users/octocat/repos',
+                    'events_url' => 'https://api.github.com/users/octocat/events{/privacy}',
+                    'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                    'type' => 'User',
+                    'site_admin' => false
+                ],
+                'body' => 'Here is the body for the review.',
+                'commit_id' => 'ecdd80bb57125d7ba9641ffaa4d7d2c19d3f3091',
+                'state' => 'APPROVED',
+                'html_url' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80',
+                'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12',
+                '_links' => [
+                    'html' => [
+                        'href' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80'
+                    ],
+                    'pull_request' => [
+                        'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12'
+                    ],
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->all('octocat', 'Hello-World', 12));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldShowReview()
+    {
+        $expectedValue = [
+            'id' => 80,
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following{/other_user}',
+                'gists_url' => 'https://api.github.com/users/octocat/gists{/gist_id}',
+                'starred_url' => 'https://api.github.com/users/octocat/starred{/owner}{/repo}',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events{/privacy}',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false
+            ],
+            'body' => 'Here is the body for the review.',
+            'commit_id' => 'ecdd80bb57125d7ba9641ffaa4d7d2c19d3f3091',
+            'state' => 'APPROVED',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12',
+            '_links' => [
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80'
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12'
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews/80')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->show('octocat', 'Hello-World', 12, 80));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldDeleteReview()
+    {
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('delete')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews/80')
+        ;
+
+        $api->remove('octocat', 'Hello-World', 12, 80);
+    }
+
+    /**
+     * @test
+     */
+    public function shouldShowReviewComments()
+    {
+        $expectedValue = [
+            [
+                "url" => "https://api.github.com/repos/octocat/Hello-World/pulls/comments/1",
+                "id" => 1,
+                "pull_request_review_id" => 42,
+                "diff_hunk" => "@@ -16,33 +16,40 @@ public class Connection  => IConnection...",
+                "path" => "file1.txt",
+                "position" => 1,
+                "original_position" => 4,
+                "commit_id" => "6dcb09b5b57875f334f61aebed695e2e4193db5e",
+                "original_commit_id" => "9c48853fa3dc5c1c3d6f1f1cd1f2743e72652840",
+                "user" => [
+                    "login" => "octocat",
+                    "id" => 1,
+                    "avatar_url" => "https://github.com/images/error/octocat_happy.gif",
+                    "gravatar_id" => "",
+                    "url" => "https://api.github.com/users/octocat",
+                    "html_url" => "https://github.com/octocat",
+                    "followers_url" => "https://api.github.com/users/octocat/followers",
+                    "following_url" => "https://api.github.com/users/octocat/following[/other_user]",
+                    "gists_url" => "https://api.github.com/users/octocat/gists[/gist_id]",
+                    "starred_url" => "https://api.github.com/users/octocat/starred[/owner][/repo]",
+                    "subscriptions_url" => "https://api.github.com/users/octocat/subscriptions",
+                    "organizations_url" => "https://api.github.com/users/octocat/orgs",
+                    "repos_url" => "https://api.github.com/users/octocat/repos",
+                    "events_url" => "https://api.github.com/users/octocat/events[/privacy]",
+                    "received_events_url" => "https://api.github.com/users/octocat/received_events",
+                    "type" => "User",
+                    "site_admin" => false,
+                ],
+                "body" => "Great stuff",
+                "created_at" => "2011-04-14T16:00:49Z",
+                "updated_at" => "2011-04-14T16:00:49Z",
+                "html_url" => "https://github.com/octocat/Hello-World/pull/1#discussion-diff-1",
+                "pull_request_url" => "https://api.github.com/repos/octocat/Hello-World/pulls/1",
+                "_links" => [
+                    "self" => [
+                        "href" => "https://api.github.com/repos/octocat/Hello-World/pulls/comments/1",
+                    ],
+                    "html" => [
+                        "href" => "https://github.com/octocat/Hello-World/pull/1#discussion-diff-1",
+                    ],
+                    "pull_request" => [
+                        "href" => "https://api.github.com/repos/octocat/Hello-World/pulls/1",
+                    ],
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('get')
+            ->with('/repos/octocat/Hello-World/pulls/1/reviews/42/comments')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->comments('octocat', 'Hello-World', 1, 42));
+    }
+
+    /**
+     * @test
+     */
+    public function shouldCreateReviewComment()
+    {
+        $data = [
+            'event' => 'APPROVE',
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('post')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews')
+        ;
+
+        $api->create('octocat', 'Hello-World', 12, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotCreateReviewWithoutEvent()
+    {
+        $data = [
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 12, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\InvalidArgumentException
+     */
+    public function shouldNotCreateReviewWithInvalidEvent()
+    {
+        $data = [
+            'event' => 'DISMISSED',
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->create('octocat', 'Hello-World', 12, $data);
+    }
+
+    /**
+     * @test
+     */
+    public function shouldSubmitReviewComment()
+    {
+        $expectedValue = [
+            'id' => 80,
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following{/other_user}',
+                'gists_url' => 'https://api.github.com/users/octocat/gists{/gist_id}',
+                'starred_url' => 'https://api.github.com/users/octocat/starred{/owner}{/repo}',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events{/privacy}',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false
+            ],
+            'body' => 'Here is the body for the review.',
+            'commit_id' => 'ecdd80bb57125d7ba9641ffaa4d7d2c19d3f3091',
+            'state' => 'APPROVED',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12',
+            '_links' => [
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80'
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12'
+                ],
+            ],
+        ];
+        $data = [
+            'event' => 'APPROVE',
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('post')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews/80/events')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->submit('octocat', 'Hello-World', 12, 80, $data));
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\MissingArgumentException
+     */
+    public function shouldNotSubmitReviewWithoutEvent()
+    {
+        $data = [
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->submit('octocat', 'Hello-World', 12, 80, $data);
+    }
+
+    /**
+     * @test
+     * @expectedException \Github\Exception\InvalidArgumentException
+     */
+    public function shouldNotSubmitReviewWithInvalidEvent()
+    {
+        $data = [
+            'event' => 'DISMISSED',
+            'body' => 'Nice change',
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->never())
+            ->method('post')
+        ;
+
+        $api->submit('octocat', 'Hello-World', 12, 80, $data);
+    }
+
+    /**
+     * @test
+     */
+    public function shouldDismissReview()
+    {
+        $expectedValue = [
+            'id' => 80,
+            'user' => [
+                'login' => 'octocat',
+                'id' => 1,
+                'avatar_url' => 'https://github.com/images/error/octocat_happy.gif',
+                'gravatar_id' => '',
+                'url' => 'https://api.github.com/users/octocat',
+                'html_url' => 'https://github.com/octocat',
+                'followers_url' => 'https://api.github.com/users/octocat/followers',
+                'following_url' => 'https://api.github.com/users/octocat/following{/other_user}',
+                'gists_url' => 'https://api.github.com/users/octocat/gists{/gist_id}',
+                'starred_url' => 'https://api.github.com/users/octocat/starred{/owner}{/repo}',
+                'subscriptions_url' => 'https://api.github.com/users/octocat/subscriptions',
+                'organizations_url' => 'https://api.github.com/users/octocat/orgs',
+                'repos_url' => 'https://api.github.com/users/octocat/repos',
+                'events_url' => 'https://api.github.com/users/octocat/events{/privacy}',
+                'received_events_url' => 'https://api.github.com/users/octocat/received_events',
+                'type' => 'User',
+                'site_admin' => false
+            ],
+            'body' => 'Here is the body for the review.',
+            'commit_id' => 'ecdd80bb57125d7ba9641ffaa4d7d2c19d3f3091',
+            'state' => 'APPROVED',
+            'html_url' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80',
+            'pull_request_url' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12',
+            '_links' => [
+                'html' => [
+                    'href' => 'https://github.com/octocat/Hello-World/pull/12#pullrequestreview-80'
+                ],
+                'pull_request' => [
+                    'href' => 'https://api.github.com/repos/octocat/Hello-World/pulls/12'
+                ],
+            ],
+        ];
+
+        $api = $this->getApiMock();
+        $api
+            ->expects($this->once())
+            ->method('put')
+            ->with('/repos/octocat/Hello-World/pulls/12/reviews/80/dismissals')
+            ->willReturn($expectedValue);
+
+        $this->assertSame($expectedValue, $api->dismiss('octocat', 'Hello-World', 12, 80));
+    }
+
+    protected function getApiClass()
+    {
+        return Review::class;
+    }
+}
diff --git a/test/Github/Tests/Api/PullRequestTest.php b/test/Github/Tests/Api/PullRequestTest.php
index 8bb3bcb1f72..672093f5cda 100644
--- a/test/Github/Tests/Api/PullRequestTest.php
+++ b/test/Github/Tests/Api/PullRequestTest.php
@@ -305,6 +305,16 @@ public function shouldGetCommentsApiObject()
         $this->assertInstanceOf(\Github\Api\PullRequest\Comments::class, $api->comments());
     }
 
+    /**
+     * @test
+     */
+    public function shouldGetReviewApiObject()
+    {
+        $api = $this->getApiMock();
+
+        $this->assertInstanceOf(\Github\Api\PullRequest\Review::class, $api->reviews());
+    }
+
     /**
      * @return string
      */