Add the comment of number_mask
@@ -779,7 +779,7 @@ struct rt_thread
rt_uint8_t number;
rt_uint8_t high_mask;
#endif /* RT_THREAD_PRIORITY_MAX > 32 */
- rt_uint32_t number_mask;
+ rt_uint32_t number_mask; /**< priority number mask */
#ifdef RT_USING_MUTEX
/* object for IPC */
