diff --git a/examples/event/main.go b/examples/event/main.go
index 13c4574..402ee10 100644
--- a/examples/event/main.go
+++ b/examples/event/main.go
@@ -30,7 +30,9 @@ func addEvent() {
 		fmt.Println("add events")
 	}
 
+	// start hook
 	s := robotgo.Start()
+	// end hook
 	defer robotgo.End()
 
 	for ev := range s {