diff --git a/gtk/gtkwindow.h b/gtk/gtkwindow.h
index 4d97020ea8..b40efdc875 100644
--- a/gtk/gtkwindow.h
+++ b/gtk/gtkwindow.h
@@ -65,6 +65,8 @@ struct _GtkWindow
  * @activate_default: Activates the default widget for the window.
  * @keys_changed: Signal gets emitted when the set of accelerators or
  *   mnemonics that are associated with window changes.
+ * @enable_debugging: Class handler for the #GtkWindow::enable-debugging
+ *   keybinding signal. Since: 3.14
  */
 struct _GtkWindowClass
 {