diff --git a/src/MetaTech/Silex/Ws/Authentication.php b/src/MetaTech/Silex/Ws/Authentication.php
index 3a2b2db..854c69a 100644
--- a/src/MetaTech/Silex/Ws/Authentication.php
+++ b/src/MetaTech/Silex/Ws/Authentication.php
@@ -77,6 +77,7 @@ class Authentication
      */
     public function checkUser($login, $password, $key)
     {
+        // implements with userProvider on subclasse
         return true;
     }