diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 582a40753c70..d5cab8d6f384 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -40,3 +40,7 @@
 
 /ydb/core/viewer @ydb-platform/ui-backend
 /ydb/core/protos/node_whiteboard.proto @ydb-platform/ui-backend
+
+/ydb/core/formats/arrow @ydb-platform/cs
+/ydb/core/tx/columnshard @ydb-platform/cs
+