diff --git a/cocos2dx/event_dispatcher/CCEventDispatcher.cpp b/cocos2dx/event_dispatcher/CCEventDispatcher.cpp
index 9a982949f9..cb796bb0a7 100644
--- a/cocos2dx/event_dispatcher/CCEventDispatcher.cpp
+++ b/cocos2dx/event_dispatcher/CCEventDispatcher.cpp
@@ -121,6 +121,7 @@ void EventDispatcher::addEventListenerWithSceneGraphPriority(EventListener* list
 void EventDispatcher::addEventListenerWithFixedPriority(EventListener* listener, int fixedPriority)
 {
     CCASSERT(!listener->_isRegistered, "The listener has been registered.");
+    CCASSERT(fixedPriority != 0, "0 priority is forbidden for fixed priority since it's used for scene graph based priority.");
     
     if (!listener->checkAvaiable())
         return;
diff --git a/cocos2dx/event_dispatcher/CCEventDispatcher.h b/cocos2dx/event_dispatcher/CCEventDispatcher.h
index db04f54ea8..621262272b 100644
--- a/cocos2dx/event_dispatcher/CCEventDispatcher.h
+++ b/cocos2dx/event_dispatcher/CCEventDispatcher.h
@@ -59,7 +59,7 @@ public:
      *  @param listener The listener of a specified event.
      *  @param node The priority of the listener is based on the draw order of this node.
      *  @note  The priority of scene graph will be fixed value 0. So the order of listener item
-     *          in the vector will be ' <0, =0, scene graph, >0'.
+     *          in the vector will be ' <0, scene graph (0 priority), >0'.
      */
     void addEventListenerWithSceneGraphPriority(EventListener* listener, Node* node);
 
@@ -67,6 +67,7 @@ public:
      *  @param listener The listener of a specified event.
      *  @param fixedPriority The fixed priority of the listener.
      *  @note A lower priority will be called before the ones that have a higher value.
+     *        0 priority is forbidden for fixed priority since it's used for scene graph based priority.
      */
     void addEventListenerWithFixedPriority(EventListener* listener, int fixedPriority);