diff --git a/internal/util/mqclient/rmq_id.go b/internal/util/mqclient/rmq_id.go
index f4f68cb445..816ae11257 100644
--- a/internal/util/mqclient/rmq_id.go
+++ b/internal/util/mqclient/rmq_id.go
@@ -24,6 +24,7 @@ type rmqID struct {
 // Check if rmqID implements MessageID interface
 var _ MessageID = &rmqID{}
 
+// Serialize convert rmq message id to []byte
 func (rid *rmqID) Serialize() []byte {
 	return SerializeRmqID(rid.messageID)
 }