* @parameter_type: the type of the parameter that must be passed to the
* activate function for this action, given as a single
* GVariant type string (or %NULL for no parameter)
- * @state: the initial state for this action, given in GVariant text
- * format. The state is parsed with no extra type information,
- * so type tags must be added to the string if they are
- * necessary. Stateless actions should give %NULL here.
+ * @state: the initial state for this action, given in
+ * [GVariant text format][gvariant-text]. The state is parsed
+ * with no extra type information, so type tags must be added to
+ * the string if they are necessary. Stateless actions should
+ * give %NULL here.
* @change_state: the callback to connect to the "change-state" signal
* of the action. All stateful actions should provide a
* handler here; stateless actions should not.