diff --git a/src/combine-md-files b/src/combine-md-files
index 59d838a..75d3767 100644
--- a/src/combine-md-files
+++ b/src/combine-md-files
@@ -1,5 +1,22 @@
 #!/bin/sh
 
+# Copyright (c) 2021 Daniel Mowitz <xslfeed.daniel@mowitz.rocks>
+#
+# This file is part of xslfeed.
+#
+# xslfeed is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# xslfeed 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 Affero General Public License
+# along with xslfeed.  If not, see <https://www.gnu.org/licenses/>.
+
 echo "# $1"
 echo ""
 shift