diff --git a/internal/util/mqclient/pulsar_client.go b/internal/util/mqclient/pulsar_client.go
index cf8f3ffb05..c46e05d371 100644
--- a/internal/util/mqclient/pulsar_client.go
+++ b/internal/util/mqclient/pulsar_client.go
@@ -74,6 +74,7 @@ func (pc *pulsarClient) CreateReader(options ReaderOptions) (Reader, error) {
 	return reader, nil
 }
 
+// Subscribe creates a pulsar consumer instance and subscribe a topic
 func (pc *pulsarClient) Subscribe(options ConsumerOptions) (Consumer, error) {
 	receiveChannel := make(chan pulsar.ConsumerMessage, options.BufSize)
 	consumer, err := pc.client.Subscribe(pulsar.ConsumerOptions{