diff --git a/gtk/gtkfilechooser.c b/gtk/gtkfilechooser.c
index 91b0caa371..26240c95a6 100644
--- a/gtk/gtkfilechooser.c
+++ b/gtk/gtkfilechooser.c
@@ -2269,8 +2269,8 @@ gtk_file_chooser_get_do_overwrite_confirmation (GtkFileChooser *chooser)
  * @chooser: a #GtkFileChooser
  * @id: id for the added choice
  * @label: user-visible label for the added choice
- * @options: ids for the options of the choice, or %NULL for a boolean choice
- * @option_labels: user-visible labels for the options, must be the same length as @options
+ * @options: (nullable) (array zero-terminated=1): ids for the options of the choice, or %NULL for a boolean choice
+ * @option_labels: (nullable) (array zero-terminated=1): user-visible labels for the options, must be the same length as @options
  *
  * Adds a 'choice' to the file chooser. This is typically implemented
  * as a combobox or, for boolean choices, as a checkbutton. You can select