diff --git a/internal/querycoord/impl.go b/internal/querycoord/impl.go
index 933e282a30f541adb77941cb21ef02e223792f30..bd0a1e7baa0ea59ca5b3c48d04ebf91760c652d2 100644
--- a/internal/querycoord/impl.go
+++ b/internal/querycoord/impl.go
@@ -62,6 +62,8 @@ func (qc *QueryCoord) GetTimeTickChannel(ctx context.Context) (*milvuspb.StringR
 	}, nil
 }
 
+// GetStatisticsChannel return the statistics channel
+// Statistics channel contains statistics infos of query nodes, such as segment infos, memory infos
 func (qc *QueryCoord) GetStatisticsChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
 	return &milvuspb.StringResponse{
 		Status: &commonpb.Status{