diff --git a/csst_dfs_api/facility/level2.py b/csst_dfs_api/facility/level2.py
index 2183b585a57606bafe54106bded2eb29d933d376..52ae413dfe572ed14ed0c086b636413309e57f74 100644
--- a/csst_dfs_api/facility/level2.py
+++ b/csst_dfs_api/facility/level2.py
@@ -87,7 +87,8 @@ class Level2DataApi(object):
         ''' insert a level2 record into database
 
         :param kwargs: Parameter dictionary, key items support:
-            level1_id: [int]
+            level0_id : [str] optional
+            level1_id: [int] optional
             brick_id: [int]
             module_id : [str]
             object_name: [str]