diff --git a/lib/Config.php b/lib/Config.php
index e7be7bc3..67ed19d9 100644
--- a/lib/Config.php
+++ b/lib/Config.php
@@ -32,6 +32,8 @@ public function __construct()
     }
 
     /**
+     * @param mixed $clientConfigClassName
+     *
      * @return Configuration
      */
     public function convertToClientConfig($clientConfigClassName)