diff --git a/gtk/gtkaboutdialog.c b/gtk/gtkaboutdialog.c
index 269c84051b..246b7abe23 100644
--- a/gtk/gtkaboutdialog.c
+++ b/gtk/gtkaboutdialog.c
@@ -119,6 +119,7 @@ static const LicenseInfo gtk_license_info [] = {
   { N_("Custom License") , NULL },
   { N_("GNU General Public License, version 2 or later"), "http://www.gnu.org/licenses/old-licenses/gpl-2.0.html" },
   { N_("GNU General Public License, version 3 or later"), "http://www.gnu.org/licenses/gpl-3.0.html" },
+  { N_("GNU Affero General Public License, version 3 or later"), "http://www.gnu.org/licenses/agpl-3.0.html" },
   { N_("GNU Lesser General Public License, version 2.1 or later"), "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html" },
   { N_("GNU Lesser General Public License, version 3 or later"), "http://www.gnu.org/licenses/lgpl-3.0.html" },
   { N_("BSD 2-Clause License"), "http://opensource.org/licenses/bsd-license.php" },
diff --git a/gtk/gtkaboutdialog.h b/gtk/gtkaboutdialog.h
index 98279fbb58..e2c1d734f8 100644
--- a/gtk/gtkaboutdialog.h
+++ b/gtk/gtkaboutdialog.h
@@ -49,6 +49,7 @@ typedef struct _GtkAboutDialogPrivate GtkAboutDialogPrivate;
  *   developer
  * @GTK_LICENSE_GPL_2_0: The GNU General Public License, version 2.0 or later
  * @GTK_LICENSE_GPL_3_0: The GNU General Public License, version 3.0 or later
+ * @GTK_LICENSE_AGPL_3_0: The GNU Affero General Public License, version 3.0 or later. Since: 3.22
  * @GTK_LICENSE_LGPL_2_1: The GNU Lesser General Public License, version 2.1 or later
  * @GTK_LICENSE_LGPL_3_0: The GNU Lesser General Public License, version 3.0 or later
  * @GTK_LICENSE_BSD: The BSD standard license
@@ -72,6 +73,8 @@ typedef enum {
   GTK_LICENSE_GPL_2_0,
   GTK_LICENSE_GPL_3_0,
 
+  GTK_LICENSE_AGPL_3_0,
+
   GTK_LICENSE_LGPL_2_1,
   GTK_LICENSE_LGPL_3_0,