diff --git a/cocos/base/CCScheduler.cpp b/cocos/base/CCScheduler.cpp
index 5b692f90cf..c757562de5 100644
--- a/cocos/base/CCScheduler.cpp
+++ b/cocos/base/CCScheduler.cpp
@@ -477,6 +477,7 @@ void Scheduler::schedulePerFrame(const ccSchedulerFunc& callback, void *target,
             }
             else
             {
+            	// unschedule it and add it back later.
                 unscheduleUpdate(target);
             }
         }