diff --git a/src/UriInterface.php b/src/UriInterface.php
index bdf68c7..9a67725 100644
--- a/src/UriInterface.php
+++ b/src/UriInterface.php
@@ -205,6 +205,10 @@ public function withPort($port);
      * The path MUST be prefixed with "/"; if not, the implementation MAY
      * provide the prefix itself.
      *
+     * The implementation MUST percent-encode reserved characters as
+     * specified in RFC 3986, Section 2, but MUST NOT double-encode any
+     * characters.
+     *
      * An empty path value is equivalent to removing the path.
      *
      * @param string $path The path to use with the new instance.
@@ -223,6 +227,10 @@ public function withPath($path);
      * Additionally, the query string SHOULD be parseable by parse_str() in
      * order to be valid.
      *
+     * The implementation MUST percent-encode reserved characters as
+     * specified in RFC 3986, Section 2, but MUST NOT double-encode any
+     * characters.
+     *
      * An empty query string value is equivalent to removing the query string.
      *
      * @param string $query The query string to use with the new instance.