diff --git a/README.md b/README.md
index cb50226..d5f64c9 100644
--- a/README.md
+++ b/README.md
@@ -315,7 +315,7 @@ func (slf *TestService2) OnInit() error {
 }
 
 
-func (slf *TestService2) OnCron(){
+func (slf *TestService2) OnCron(cron *timer.Cron){
 	fmt.Printf(":A minute passed!\n")
 }
 ```