Index: PersistentAlarm.h
===================================================================
diff -u -refdbe5815e423124fdfa1a1efba8b61dacf170e8 -rb6fffb70532da8e18ff2cb8357a378d517052db0
--- PersistentAlarm.h	(.../PersistentAlarm.h)	(revision efdbe5815e423124fdfa1a1efba8b61dacf170e8)
+++ PersistentAlarm.h	(.../PersistentAlarm.h)	(revision b6fffb70532da8e18ff2cb8357a378d517052db0)
@@ -32,6 +32,7 @@
 // ********** public definitions **********
 
 #ifdef _DG_
+/// FPGA persistent alarm groups data structure
 typedef enum
 {
     TWO_WIRE_ADC_TEMP_SENSORS = 0,                              ///< Two wire ADC temperature sensors.
@@ -49,10 +50,12 @@
 #endif
 
 #ifdef _HD_
+/// FPGA persistent alarm groups data structure
 typedef enum
 {
-    PLACE_HOLDER = 0,
-    NUM_OF_FPGA_SENSOR_GROUPS
+    OCCLUSION_SENSOR = 0,                                       ///< Occlusion sensor.
+    ARTERIAL_SENSOR,                                            ///< Arterial sensor.
+    NUM_OF_FPGA_SENSOR_GROUPS                                   ///< Number of FPGA sensor groups.
 } FPGA_PERSISTENT_ALARMS_GROUP_T;
 #endif