diff --git a/src/Fabiang/Xmpp/Event/EventManager.php b/src/Fabiang/Xmpp/Event/EventManager.php
index 6b17290..e139d29 100644
--- a/src/Fabiang/Xmpp/Event/EventManager.php
+++ b/src/Fabiang/Xmpp/Event/EventManager.php
@@ -81,7 +81,7 @@ public function __construct(EventInterface $eventObject = null)
     /**
      * {@inheritDoc}
      */
-    public function attach($event, /* callback */$callback)
+    public function attach($event, $callback)
     {
         if (!is_callable($callback, true)) {
             throw new InvalidArgumentException(