diff --git a/README.md b/README.md
index 4ccdbdb0965..ab28d5dabb0 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ For old version please check:
 
 A simple Object Oriented wrapper for GitHub API, written with PHP5.
 
-Uses [GitHub API v3](http://developer.github.com/v3/). The object API is very similar to the RESTful API.
+Uses [GitHub API v3](http://developer.github.com/v3/) & supports [GitHub API v4](http://developer.github.com/v4). The object API (v3) is very similar to the RESTful API.
 
 ## Features
 
@@ -114,5 +114,6 @@ See the [`doc` directory](doc/) for more detailed documentation.
 - Thanks to [Rolf van de Krol](http://github.com/rolfvandekrol) for his countless contributions.
 - Thanks to [Nicolas Pastorino](http://github.com/jeanvoye) for his contribution on the Pull Request API.
 - Thanks to [Edoardo Rivello](http://github.com/erivello) for his contribution on the Gists API.
+- Thanks to [Miguel Piedrafita](https://github.com/m1guelpf) for his contribution to the v4 & Apps API.
 
 Thanks to GitHub for the high quality API and documentation.
diff --git a/doc/README.md b/doc/README.md
index d6ab57637dd..b1c99e97b22 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -1,7 +1,10 @@
 Navigation
 ==========
 
-APIs:
+v4 API:
+* [GraphQL](graphql.md)
+
+v3 APIs:
 * [Applications](apps.md)
 * [Authorizations](authorizations.md)
 * [Commits](commits.md)
@@ -11,6 +14,7 @@ APIs:
 * [Enterprise](enterprise.md)
 * [Gists](gists.md)
   * [Comments](gists/comments.md)
+* [GraphQL](graphql.md)
 * [Issues](issues.md)
   * [Assignees](issue/assignees.md)
   * [Comments](issue/comments.md)
diff --git a/doc/graphql.md b/doc/graphql.md
new file mode 100644
index 00000000000..85def0f556b
--- /dev/null
+++ b/doc/graphql.md
@@ -0,0 +1,10 @@
+## GraphQL API
+[Back to the navigation](README.md)
+
+Wraps [GitHub v4 API (GraphQL API)](http://developer.github.com/v4/).
+
+#### Execute a query
+
+```php
+$rateLimits = $client->api('graphql')->execute($query);
+```
diff --git a/lib/Github/Api/GraphQL.php b/lib/Github/Api/GraphQL.php
index 90974015463..6a112099e4c 100644
--- a/lib/Github/Api/GraphQL.php
+++ b/lib/Github/Api/GraphQL.php
@@ -5,13 +5,15 @@
 /**
  * GraphQL API.
  *
- * Part of the Github API Early-Access Program
+ * Part of the Github v4 API
  *
- * @link   https://developer.github.com/early-access/graphql/
+ * @link   https://developer.github.com/v4/
  * @author Miguel Piedrafita <soy@miguelpiedrafita.com>
  */
 class GraphQL extends AbstractApi
 {
+    use AcceptHeaderTrait;
+    
     /**
      * @param string $query
      *
@@ -19,6 +21,7 @@ class GraphQL extends AbstractApi
      */
     public function execute($query)
     {
+        $this->acceptHeaderValue = 'application/vnd.github.v4+json';
         $params = array(
             'query' => $query
         );