diff --git a/internal/distributed/indexcoord/client/client.go b/internal/distributed/indexcoord/client/client.go
index cf237b653c..467e466846 100644
--- a/internal/distributed/indexcoord/client/client.go
+++ b/internal/distributed/indexcoord/client/client.go
@@ -103,6 +103,7 @@ func (c *Client) getIndexCoordAddr() (string, error) {
 	return ms.Address, nil
 }
 
+// newGrpcClient create a new grpc client of IndexCoord.
 func (c *Client) newGrpcClient(cc *grpc.ClientConn) interface{} {
 	return indexpb.NewIndexCoordClient(cc)
 }