Index: firmware/App/Drivers/Comm.h
===================================================================
diff -u -rde5a0d43bdef611d963d11855bc958a8d8899a09 -ra1daba982e3117ce45437384e770b50cfda7b7a7
--- firmware/App/Drivers/Comm.h	(.../Comm.h)	(revision de5a0d43bdef611d963d11855bc958a8d8899a09)
+++ firmware/App/Drivers/Comm.h	(.../Comm.h)	(revision a1daba982e3117ce45437384e770b50cfda7b7a7)
@@ -20,10 +20,19 @@
 
 #include "HDCommon.h"
 
+/**
+ *  @defgroup CommLowLevel CommLowLevel
+ *  @brief The low level communication module provides low level comm signal,
+ *  status, and interrupt functions.
+ *
+ *  @addtogroup CommLowLevel
+ *  @{
+ */
+
 // ********** public definitions **********
 
-#define SCI_DMA_TRANSMIT_INT            0x00010000
-#define SCI_DMA_RECEIVE_INT             0x00060000
+#define SCI_DMA_TRANSMIT_INT            0x00010000      ///< bit mask for setting/clearing serial DMA transmit interrupts.
+#define SCI_DMA_RECEIVE_INT             0x00060000      ///< bit mask for setting/clearing serial DMA receive interrupts.
 
 // ********** public function prototypes **********
 
@@ -49,4 +58,6 @@
 
 BOOL isCAN1TransmitInProgress( void );
 
+/**@}*/
+
 #endif