diff --git a/datalink814_ge/src/linklayer/linklayer814.c b/datalink814_ge/src/linklayer/linklayer814.c
index e34996f..ef037eb 100644
--- a/datalink814_ge/src/linklayer/linklayer814.c
+++ b/datalink814_ge/src/linklayer/linklayer814.c
@@ -288,7 +288,8 @@ L2_SCHD_EVENT* L2_CreatNewSchdEvent(L2_INST* instPtr, L2_EVENT_TYPE event){
  * @brief   Delete a schedule event, remove the event from event pool, 
  * 			release memory, release event ID.
  *
- * @param   schdEvent  pointer to the schedule event which is aboute to be deleted.
+ * @param   instPtr	a pointer to linklayer instance
+ * @param   eventId	ID of the event
  *
  * @return  SUCCESS
  * 			error code
@@ -317,7 +318,15 @@ int32_t L2_DeletSchdEvent(L2_INST* instPtr, int32_t eventId){
 	return SUCCESS;
 }
 
-
+/*****************************************************************************/
+/**
+ * @brief   Clear all event in the event pool.
+ *
+ * @param   instPtr	a pointer to linklayer instance
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
 void L2_ClearSchdEvent(L2_INST* instPtr){
 	ASSERT(instPtr != NULL);
 	for(int32_t i = 0; i < instPtr->schdEventCnt; i++){
@@ -383,6 +392,7 @@ inline bool L2_isEventScheduled(L2_SCHD_EVENT* schdEvent){
 /**
  * @brief   Schedule a event at a specific time(indexed by frame and slot number)
  *
+ * @param   instPtr		a pointer to linklayer instance
  * @param   schdEvent  pointer to the schedule event.
  * @param	frameNum		schedule frame number
  * @param	slotNum		schedule slot number
@@ -412,6 +422,7 @@ int32_t L2_ScheduleEventAt(L2_INST* instPtr, L2_SCHD_EVENT* schdEvent, uint32_t
 /**
  * @brief   Schedule a event after a specific time period.
  *
+ * @param   instPtr		a pointer to linklayer instance
  * @param   schdEvent  pointer to the schedule event.
  * @param	numSlots	how many slot later the event should be scheduled
  *
@@ -434,6 +445,7 @@ int32_t L2_ScheduleEventAfter(L2_INST* instPtr, L2_SCHD_EVENT* schdEvent, uint32
 /**
  * @brief   Reschedule a event at a specific time(indexed by frame and slot number)
  *
+ * @param   instPtr		a pointer to linklayer instance
  * @param   schdEvent  pointer to the schedule event.
  * @param	frameNum		schedule frame number
  * @param	slotNum		schedule slot number
@@ -455,14 +467,13 @@ int32_t L2_RecheduleEventAt(L2_INST* instPtr, L2_SCHD_EVENT* schdEvent, uint32_t
 /**
  * @brief   Rechedule a event after a specific time period.
  *
+ * @param   instPtr		a pointer to linklayer instance
  * @param   schdEvent  pointer to the schedule event.
  * @param	numSlots	how many slot later the event should be scheduled
  *
  * @return  FAILURE, event has already been scheduled/schedule time not allowed.
  * 			SUCCESS
  *
- * @return  NONE.
- *
  ******************************************************************************/
 int32_t L2_RecheduleEventAfter(L2_INST* instPtr, L2_SCHD_EVENT* schdEvent, uint32_t numSlots){
 	ASSERT(schdEvent != NULL);
@@ -478,7 +489,7 @@ int32_t L2_RecheduleEventAfter(L2_INST* instPtr, L2_SCHD_EVENT* schdEvent, uint3
 /**
  * @brief   Check and excute schedule event in event pool illiterate.
  *
- * @param   NONE.
+ * @param   instPtr		a pointer to linklayer instance
  *
  * @return  NONE.
  *
@@ -534,7 +545,7 @@ L2_FRAME_TYPE L2_GetLastRcvFrameType(L2_INST* instPtr) {
  * @brief   Update L2 frame state, check if there is any valid L2 frame data in
  * 			data buffer, update receive frame status.
  *
- * @param   NONE.
+ * @param   instPtr		a pointer to linklayer instance
  *
  * @return	NONE.
  *
@@ -635,7 +646,7 @@ void L2_FrameStateUpdate(L2_INST* instPtr) {
 /**
  * @brief   Layer 2 setup next slot operation, update current operating frame.
  *
- * @param   instPtr		a pointer to physical layer controller instance
+ * @param   instPtr		a pointer to linklayer instance
  * @param   txrxMode	tx/rx state for next slot
  * @param   frameType	frame type of next slot.
  *