diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index 51187d8557..e025993c6d 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1475,7 +1475,7 @@ class Request
      *
      * @see https://tools.ietf.org/html/rfc7231#section-4.2.3
      *
-     * @return bool
+     * @return bool True for GET and HEAD, false otherwise
      */
     public function isMethodCacheable()
     {