diff --git a/internal/util/mqclient/rmq_producer.go b/internal/util/mqclient/rmq_producer.go
index 2fcdeaca1c..ff2614d97f 100644
--- a/internal/util/mqclient/rmq_producer.go
+++ b/internal/util/mqclient/rmq_producer.go
@@ -23,6 +23,7 @@ type rmqProducer struct {
 	p rocksmq.Producer
 }
 
+// Topic returns the topic of rmq producer
 func (rp *rmqProducer) Topic() string {
 	return rp.p.Topic()
 }