diff --git a/src/js/controller/DrawingController.js b/src/js/controller/DrawingController.js
index 16ba5e0d..d59a9282 100644
--- a/src/js/controller/DrawingController.js
+++ b/src/js/controller/DrawingController.js
@@ -204,6 +204,7 @@
   };
 
   /**
+   * Trigger tool move on key up in order to acknowledge modifier changes.
    * @private
    */
   ns.DrawingController.prototype.onKeyup_ = function (event) {