* GAction:name:
*
* The name of the action. This is mostly meaningful for identifying
- * the action once it has been added to a #GActionGroup.
+ * the action once it has been added to a #GActionGroup. It is immutable.
*
* Since: 2.28
**/
* GAction:parameter-type:
*
* The type of the parameter that must be given when activating the
- * action.
+ * action. This is immutable, and may be %NULL if no parameter is needed when
+ * activating the action.
*
* Since: 2.28
**/
* GAction:state-type:
*
* The #GVariantType of the state that the action has, or %NULL if the
- * action is stateless.
+ * action is stateless. This is immutable.
*
* Since: 2.28
**/
* The return value (if non-%NULL) should be freed with
* g_variant_unref() when it is no longer required.
*
- * Returns: (transfer full): the state range hint
+ * Returns: (nullable) (transfer full): the state range hint
*
* Since: 2.28
**/