/**
* gtk_clutter_zoomable_set_adjustment:
* @zoomable: a #GtkClutterZoomable
- * @z_adjust: a #GtkAdjustment, or %NULL
+ * @z_adjust: (null-ok): a #GtkAdjustment, or %NULL
*
* Sets the adjustment used to determine the zoom factor of
* the zoomable actor
* Retrieves the adjustment used to determine the zoom factor of
* the zoomable actor
*
- * Return value: a #GtkAdjustment
+ * Return value: (transfer none): a #GtkAdjustment
*
* Since: 1.0
*/