diff --git a/tests/unit/iterator_handling/test_dict_helpers.py b/tests/unit/iterator_handling/test_dict_helpers.py
index 9edc942..da973e7 100644
--- a/tests/unit/iterator_handling/test_dict_helpers.py
+++ b/tests/unit/iterator_handling/test_dict_helpers.py
@@ -1,3 +1,7 @@
+"""
+tests for corelibs.iterator_handling.dict_helpers
+"""
+
 import pytest
 from typing import Any
 from corelibs.iterator_handling.dict_helpers import mask