diff --git a/internal/distributed/querynode/client/client.go b/internal/distributed/querynode/client/client.go
index 9f4bc4c070..a15c3d86a1 100644
--- a/internal/distributed/querynode/client/client.go
+++ b/internal/distributed/querynode/client/client.go
@@ -337,6 +337,7 @@ func (c *Client) ReleasePartitions(ctx context.Context, req *querypb.ReleasePart
 	return ret.(*commonpb.Status), err
 }
 
+// ReleaseSegments releases the data of the specified segments in QueryNode.
 func (c *Client) ReleaseSegments(ctx context.Context, req *querypb.ReleaseSegmentsRequest) (*commonpb.Status, error) {
 	ret, err := c.recall(func() (interface{}, error) {
 		client, err := c.getGrpcClient()