diff --git a/include/ulib/notifier.h b/include/ulib/notifier.h
index 1fc0e183..1c04d2d5 100644
--- a/include/ulib/notifier.h
+++ b/include/ulib/notifier.h
@@ -187,6 +187,7 @@ public:
 #endif
 	
 #ifdef HAVE_EPOLL_WAIT
+	// this timeout does not include time spent in event handlers, only time waiting on epoll
    static bool waitOnAsynchronousBatch(const UVector<UEventFd *>& waiting, int op, int timeoutMS = -1);
 #endif