diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index cdaa57e0e6..888e5fdc01 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1466,6 +1466,8 @@ class Request
     /**
      * Checks whether the method is safe or not.
      *
+     * @see https://tools.ietf.org/html/rfc7231#section-4.2.1
+     *
      * @param bool $andCacheable Adds the additional condition that the method should be cacheable. True by default.
      *
      * @return bool
@@ -1478,6 +1480,8 @@ class Request
     /**
      * Checks whether the method is cacheable or not.
      *
+     * @see https://tools.ietf.org/html/rfc7231#section-4.2.3
+     *
      * @return bool
      */
     public function isMethodCacheable()