diff --git a/framework/base/Controller.php b/framework/base/Controller.php
index a90150d058..00a22eeb0c 100644
--- a/framework/base/Controller.php
+++ b/framework/base/Controller.php
@@ -317,6 +317,7 @@ class Controller extends Component implements ViewContextInterface
     }
 
     /**
+     * Returns the unique ID of the controller.
      * @return string the controller ID that is prefixed with the module ID (if any).
      */
     public function getUniqueId()