Index: firmware/App/Services/SystemComm.h
===================================================================
diff -u -rd91a24c730aeb5cd7e3eba9ef4eca78e442911f8 -r30f049651877229042e3f8700c8596e5b9a1e0f4
--- firmware/App/Services/SystemComm.h	(.../SystemComm.h)	(revision d91a24c730aeb5cd7e3eba9ef4eca78e442911f8)
+++ firmware/App/Services/SystemComm.h	(.../SystemComm.h)	(revision 30f049651877229042e3f8700c8596e5b9a1e0f4)
@@ -39,13 +39,12 @@
     #define PC_MESSAGE_PACKET_SIZE  8
 #endif
 
-#define MSG_ID_ACK                  0xFFFF                                                          ///< Denali message ID for acknowledging received messages (when required).
 #define MSG_ACK_BIT                 0x8000                                                          ///< ACK bit in sequence number that indicates an ACK is required.
 #define MAX_MSG_SEQ_NO              0x7FFF                                                          ///< Maximum sequence number for Denali message (then wraps to 1).
 #define MIN_MSG_SEQ_NO              0x0001                                                          ///< Minimum sequence number for Denali message.
 #define MAX_ACK_MSG_SIZE            ( sizeof( MESSAGE_WRAPPER_T ) + 1 + CAN_MESSAGE_PAYLOAD_SIZE )  ///< Maximum size (in bytes) of Denali message including full (wrapped) message + sync + any CAN padding)
 
-typedef COMM_BUFFER_T   CAN_MESSAGE_BOX_T;                                                          ///< the CAN comm buffers align with the active CAN message boxes
+typedef COMM_BUFFER_T   CAN_MESSAGE_BOX_T;                                                          ///< The CAN comm buffers align with the active CAN message boxes
 
 // ********** public function prototypes **********