diff --git a/cmd/config.yaml b/cmd/config.yaml
index 23837ad..1e3f539 100644
--- a/cmd/config.yaml
+++ b/cmd/config.yaml
@@ -31,5 +31,5 @@ policy:
 # the 'trigger.cron' empty
 trigger:
   # Cron expression to trigger the cleanup, for example "0 0 * * *", leave it empty will disable the
-  # trigger and fallback to run cleanup once.
+  # trigger and fallback to run cleanup once. Note: you may need to quote the cron expression with double quote
   cron:
diff --git a/pkg/trigger/cron.go b/pkg/trigger/cron.go
index 953b4d2..6cd2666 100644
--- a/pkg/trigger/cron.go
+++ b/pkg/trigger/cron.go
@@ -49,7 +49,6 @@ func (s *cronScheduler) Submit(task func()) {
 		}()
 
 		logrus.Info("Start to run cleanup task")
-		time.Sleep(time.Minute)
 		task()
 	})
 }