GtkApplicationWindow: Add missing annotations

diff --git a/gtk/gtkapplicationwindow.c b/gtk/gtkapplicationwindow.c
index 919d92c719c4061c7a3feed1115ba03a8ee0d93b..86739a4a8456ddeb46191bab8df92acd8ad68b4c 100644 (file)
--- a/gtk/gtkapplicationwindow.c
+++ b/gtk/gtkapplicationwindow.c
@@ -1022,7 +1022,7 @@ gtk_application_window_set_help_overlay (GtkApplicationWindow *window,
  * Gets the #GtkShortcutsWindow that has been set up with
  * a prior call to gtk_application_window_set_help_overlay().
  *
- * Returns: the help overlay associated with @window, or %NULL
+ * Returns: (transfer none) (nullable): the help overlay associated with @window, or %NULL
  *
  * Since: 3.20
  */