diff --git a/packages/valory/skills/decision_maker_abci/tests/behaviours/test_sampling.py b/packages/valory/skills/decision_maker_abci/tests/behaviours/test_sampling.py
index bda9ac99d..c10ce397a 100644
--- a/packages/valory/skills/decision_maker_abci/tests/behaviours/test_sampling.py
+++ b/packages/valory/skills/decision_maker_abci/tests/behaviours/test_sampling.py
@@ -1,3 +1,24 @@
+# -*- coding: utf-8 -*-
+# ------------------------------------------------------------------------------
+#
+#   Copyright 2021-2024 Valory AG
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ------------------------------------------------------------------------------
+
+"""Test the sampling.py module of the skill."""
+
 import unittest
 from datetime import datetime