Index: firmware/App/Controllers/PresOccl.h
===================================================================
diff -u -r07a5add2dff254f7be3699e4efac2b99d3554847 -r55a6adaf81175d25c1d9cc4c96d7dfda84eede16
--- firmware/App/Controllers/PresOccl.h	(.../PresOccl.h)	(revision 07a5add2dff254f7be3699e4efac2b99d3554847)
+++ firmware/App/Controllers/PresOccl.h	(.../PresOccl.h)	(revision 55a6adaf81175d25c1d9cc4c96d7dfda84eede16)
@@ -1,4 +1,4 @@
-/**************************************************************************
+/**********************************************************************//**
  *
  *  Copyright (c) 2020 Diality Inc. - All Rights Reserved.
  *
@@ -19,20 +19,31 @@
 
 #include "Common.h"
 
+/**
+ *  @defgroup PressureOcclusion PressureOcclusion
+ *  @brief Pressure & Occlusion controller/monitor module.  Monitors the
+ *  blood line pressure sensors and pump occlusion sensors.
+ *
+ *  @addtogroup PressureOcclusion
+ *  @{
+ */
+
 // ********** public definitions **********
 
+// Pressure sensors monitored by this module
 typedef enum PressureSensors
 {
-    PRESSURE_SENSOR_ARTERIAL = 0,
-    PRESSURE_SENSOR_VENOUS,
+    PRESSURE_SENSOR_ARTERIAL = 0,           /// arterial blood line pressure sensor
+    PRESSURE_SENSOR_VENOUS,                 /// vensous blood line pressure sensor
     NUM_OF_PRESSURE_SENSORS
 } PRESSURE_SENSORS_T;
 
+// Occlusion sensors monitored by this module
 typedef enum OcclusionSensors
 {
-    OCCLUSION_SENSOR_BLOOD_PUMP = 0,
-    OCCLUSION_SENSOR_DIAL_IN_PUMP,
-    OCCLUSION_SENSOR_DIAL_OUT_PUMP,
+    OCCLUSION_SENSOR_BLOOD_PUMP = 0,        /// blood pump occlusion sensor
+    OCCLUSION_SENSOR_DIAL_IN_PUMP,          /// dialysate inlet pump occlusion sensor
+    OCCLUSION_SENSOR_DIAL_OUT_PUMP,         /// dialysate outlet pump occlusion sensor
     NUM_OF_OCCLUSION_SENSORS
 } OCCLUSION_SENSORS_T;
 
@@ -65,4 +76,6 @@
 BOOL testSetDialOutPumpOcclusionOverride( F32 value );
 BOOL testResetDialOutPumpOcclusionOverride( void );
 
+/**@}*/
+
 #endif