diff --git a/src/delarte/cli.py b/src/delarte/cli.py
index 3ed9820..efe12c5 100644
--- a/src/delarte/cli.py
+++ b/src/delarte/cli.py
@@ -1,4 +1,6 @@
-"""CLI arguments related module."""
+# Licence: GNU AGPL v3: http://www.gnu.org/licenses/
+# This file is part of [`delarte`](https://git.afpy.org/fcode/delarte.git)"""CLI arguments related module."""
+
 import argparse
 
 
diff --git a/tests/__init__.py b/tests/__init__.py
index 38bb211..2d1850d 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1,4 @@
+# Licence: GNU AGPL v3: http://www.gnu.org/licenses/
+# This file is part of [`delarte`](https://git.afpy.org/fcode/delarte.git)
+
 """Test package."""
diff --git a/tests/tests_parser.py b/tests/tests_parser.py
index 682d994..c1c20b6 100644
--- a/tests/tests_parser.py
+++ b/tests/tests_parser.py
@@ -1,3 +1,6 @@
+# Licence: GNU AGPL v3: http://www.gnu.org/licenses/
+# This file is part of [`delarte`](https://git.afpy.org/fcode/delarte.git)"""CLI arguments related module."""
+
 """Unit test for command-line args parser."""
 
 from unittest import TestCase, mock