diff --git a/tox.ini b/tox.ini
index e92d203da7b26bca7e9416b33be25266b3b2b3e6..b382ba2c8d41a50f0a3f49464a70de239072e9d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,3 +1,22 @@
+#
+# Copyright (C) 2018, 2020, 2024 Branko Majic
+#
+# This file is part of Gimmecert.
+#
+# Gimmecert is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# Gimmecert is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# Gimmecert.  If not, see <http://www.gnu.org/licenses/>.
+#
+
 [tox]
 envlist = {py38,py39},lint,doc