diff --git a/gio/giomodule.c b/gio/giomodule.c
index 00e8c487b..4b77e3db6 100644
--- a/gio/giomodule.c
+++ b/gio/giomodule.c
@@ -643,8 +643,8 @@ g_io_extension_point_free (GIOExtensionPoint *ep)
  *
  * Registers an extension point.
  *
- * Returns: the new #GIOExtensionPoint. This object is owned by GIO
- *    and should not be freed
+ * Returns: (transfer none): the new #GIOExtensionPoint. This object is
+ *    owned by GIO and should not be freed.
  */
 GIOExtensionPoint *
 g_io_extension_point_register (const char *name)
@@ -681,8 +681,8 @@ g_io_extension_point_register (const char *name)
  *
  * Looks up an existing extension point.
  *
- * Returns: the #GIOExtensionPoint, or %NULL if there is no
- *    registered extension point with the given name
+ * Returns: (transfer none): the #GIOExtensionPoint, or %NULL if there
+ *    is no registered extension point with the given name.
  */
 GIOExtensionPoint *
 g_io_extension_point_lookup (const char *name)
@@ -826,7 +826,7 @@ extension_prio_compare (gconstpointer  a,
  * If @type has already been registered as an extension for this 
  * extension point, the existing #GIOExtension object is returned.
  *
- * Returns: a #GIOExtension object for #GType
+ * Returns: (transfer none): a #GIOExtension object for #GType
  */
 GIOExtension *
 g_io_extension_point_implement (const char *extension_point_name,