diff --git a/defaults/README.md b/defaults/README.md
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+# defaults
+
+The default variable definitions of the Ansible role.
+
+Variables defined here can be overrided by the role consumers, which can be used to customize the role's behaviors.
diff --git a/defaults/main.yml b/defaults/main.yml
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+# The main default variables definition file
+#
+# Copyright 2024 The common Ansible role template contributors <https://github.com/the-common/ansible-role-template/graphs/contributors>
+# SPDX-License-Identifier: CC-BY-SA-4.0+ OR LicenseRef-Apache-2.0-If-Not-Used-In-Template-Projects