diff --git a/docker-compose.yaml b/docker-compose.yaml
index 547d83f..6c1a993 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,3 +1,20 @@
+# Copyright (C) 2018 spdfg
+#
+# This file is part of Elektron.
+#
+# Elektron 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.
+#
+# Elektron 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 Elektron.  If not, see <http://www.gnu.org/licenses/>.
+#
 version: "2"
 
 services: