diff --git a/bin/mpdevil b/bin/mpdevil
index 374d030..b277771 100755
--- a/bin/mpdevil
+++ b/bin/mpdevil
@@ -2,21 +2,20 @@
 # -*- coding: utf-8 -*-
 #
 # mpdevil - MPD Client.
-# Copyright 2020-2021 Martin Wagner <martin.wagner.dev@gmail.com>
+# Copyright (C) 2020-2021 Martin Wagner <martin.wagner.dev@gmail.com>
 #
-# This program is free software; you can redistribute it and/or modify
+# This program 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; version 3 of the License.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 #
-# This program 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.
+# This program 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 this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
-# USA
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 import gi
 gi.require_version("Gtk", "3.0")
@@ -1357,6 +1356,7 @@ class AboutDialog(Gtk.AboutDialog):
 		self.set_translator_credits("Martin de Reuver\nMartin Wagner")
 		self.set_website("https://github.com/SoongNoonien/mpdevil")
 		self.set_copyright("Copyright \xa9 2020-2021 Martin Wagner")
+		self.set_license_type(Gtk.License.GPL_3_0)
 		self.set_logo_icon_name("org.mpdevil.mpdevil")
 
 ###########################