diff --git a/internal/proxy/repack_func.go b/internal/proxy/repack_func.go
index f0c3a0248d..64f00f14c7 100644
--- a/internal/proxy/repack_func.go
+++ b/internal/proxy/repack_func.go
@@ -53,6 +53,7 @@ func insertRepackFunc(
 	return result, nil
 }
 
+// defaultInsertRepackFunc repack the dml messages.
 func defaultInsertRepackFunc(
 	tsMsgs []msgstream.TsMsg,
 	hashKeys [][]int32,