diff --git a/client/pd_service_discovery.go b/client/pd_service_discovery.go
index 7e549fb0326..f9bdf888b9f 100644
--- a/client/pd_service_discovery.go
+++ b/client/pd_service_discovery.go
@@ -187,7 +187,7 @@ func (c *pdServiceClient) IsConnectedToLeader() bool {
 	return c.isLeader
 }
 
-// NetworkAvailable implements ServiceClient.
+// Available implements ServiceClient.
 func (c *pdServiceClient) Available() bool {
 	if c == nil {
 		return false