diff --git a/ecs/jskult-batch-daily/src/batch/vjsk/vjsk_recv_file_mapper.py b/ecs/jskult-batch-daily/src/batch/vjsk/vjsk_recv_file_mapper.py
index 75fcfe66..b88851bf 100644
--- a/ecs/jskult-batch-daily/src/batch/vjsk/vjsk_recv_file_mapper.py
+++ b/ecs/jskult-batch-daily/src/batch/vjsk/vjsk_recv_file_mapper.py
@@ -1057,6 +1057,7 @@ class VjskReceiveFileMapper:
                     ,upd_dt
                     ,dwh_upd_dt
                 )
+                -- NULLに変換する対象のカラムはない
                 SELECT
                     t.hco_vid_v
                     ,t.sub_num
diff --git a/ecs/jskult-batch-daily/tests/batch/vjsk/vjsk_load/test_vjsk_load.py b/ecs/jskult-batch-daily/tests/batch/vjsk/vjsk_load/test_vjsk_load.py
index 2e2947c6..2b2afd01 100644
--- a/ecs/jskult-batch-daily/tests/batch/vjsk/vjsk_load/test_vjsk_load.py
+++ b/ecs/jskult-batch-daily/tests/batch/vjsk/vjsk_load/test_vjsk_load.py
@@ -930,6 +930,7 @@ class TestImportFileToDb:
         # teardown
 
     def test_load_13_mdb_conv_mst_ok(self, mapper):
+        # MDBコード変換表には変換対象の文字列型カラムがない
         table_name_org = mapper.get_org_table(mapper.CONDKEY_MDB_CONV_MST)
         table_name_src = mapper.get_src_table(mapper.CONDKEY_MDB_CONV_MST)