doc CHANGE improve update flag description
Refs
@@ -1143,8 +1143,9 @@ typedef enum sr_subscr_flag_e {
/**
* @brief The subscriber will be called before any other subscribers for the particular module
- * and is allowed to modify the new module data. Be careful, you cannot subscribe with this flag more times
- * for the same (set of) data node, it will not work!
+ * and is allowed to modify the new module data. It can add new changes by calling standard set functions
+ * (such as ::sr_set_item_str) on the implicit callback session and returning. Be careful, you
+ * __cannot subscribe__ with this flag __more times for the same (set of) data node__, it will not work!
*/
SR_SUBSCR_UPDATE = 32,
