diff --git a/internal/distributed/indexcoord/service.go b/internal/distributed/indexcoord/service.go
index e9a155b4da..82da812a26 100644
--- a/internal/distributed/indexcoord/service.go
+++ b/internal/distributed/indexcoord/service.go
@@ -170,6 +170,7 @@ func (s *Server) GetMetrics(ctx context.Context, request *milvuspb.GetMetricsReq
 	return s.indexcoord.GetMetrics(ctx, request)
 }
 
+// startGrpcLoop starts the grep loop of IndexCoord component.
 func (s *Server) startGrpcLoop(grpcPort int) {
 
 	defer s.loopWg.Done()