Index: firmware/App/HDCommon.h
===================================================================
diff -u -rd8852f18895c6cf3c7339aba976395720d2aa5e8 -r31c4bf94671f58375d2e1dbbbb37b37c6949e0c4
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision d8852f18895c6cf3c7339aba976395720d2aa5e8)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 31c4bf94671f58375d2e1dbbbb37b37c6949e0c4)
@@ -30,27 +30,27 @@
 // ********** build switches **********
 
 #ifndef _RELEASE_
-#define UF_TEST_ENABLED                     1
-#define UF_TEST_WITH_DG                     1
+#define UF_TEST_ENABLED                     1           // ultrafiltration test build (hard codes treatment params, re-purposes off/stop buttons)
+#define UF_TEST_WITH_DG                     1           // ultrafiltration test build (sets up DG in standby mode)
 #ifndef _VECTORCAST_
-//    #define RM46_EVAL_BOARD_TARGET          1
-//    #define BREADBOARD_TARGET               1
-//    #define SIMULATE_UI                     1
-    #define SKIP_POST                       1
-    #define DISABLE_CRC_ERROR               1
-    #define DISABLE_ACK_ERRORS              1
-    #define DISABLE_MOTOR_CURRENT_CHECKS    1
-    #define DISABLE_PUMP_FLOW_CHECKS        1
-    #define DISABLE_PUMP_SPEED_CHECKS       1
-    #define DISABLE_PUMP_DIRECTION_CHECKS   1
-    #define DISABLE_PRESSURE_CHECKS         1
-    #define DISABLE_UF_ALARMS               1
-//    #define RAW_FLOW_SENSOR_DATA            1
-//    #define SHOW_LOAD_CELL_IN_ROTOR_RPM     1
-//    #define READ_FPGA_ASYNC_DATA            1
-//    #define FLOW_DEBUG                      1
-//    #define EMC_TEST_BUILD                  1
-    #define ALARMS_DEBUG                    1
+//    #define RM46_EVAL_BOARD_TARGET          1           // limited build runs on RM46 eval board
+//    #define BREADBOARD_TARGET               1           // old breadboard system build - no longer used?
+//    #define SIMULATE_UI                     1           // build w/o requirement that UI be there
+//    #define TASK_TIMING_OUTPUT_ENABLED      1           // re-purposes alarm lamp pins for task timing
+    #define SKIP_POST                       1           // skip POST tests - all pass
+    #define DISABLE_CRC_ERROR               1           // do not error on bad CRC for CAN messages
+    #define DISABLE_ACK_ERRORS              1           // do not error on failure of other node(s) to ACK a message
+    #define DISABLE_MOTOR_CURRENT_CHECKS    1           // do not error on HD pump current checks
+    #define DISABLE_PUMP_FLOW_CHECKS        1           // do not error on HD pump flow checks
+    #define DISABLE_PUMP_SPEED_CHECKS       1           // do not error on HD pump speed checks
+    #define DISABLE_PUMP_DIRECTION_CHECKS   1           // do not error on HD pump direction checks
+    #define DISABLE_PRESSURE_CHECKS         1           // do not error on HD pressure checks
+    #define DISABLE_UF_ALARMS               1           // do not error on HD ultrafiltration checks
+//    #define RAW_FLOW_SENSOR_DATA            1           // test build will not filter flow sensor data
+//    #define READ_FPGA_ASYNC_DATA            1           // test build reads non-priority register page every other time
+//    #define FLOW_DEBUG                      1           // test build sends flow, signal strength, and occlusion readings to debug UART
+//    #define EMC_TEST_BUILD                  1           // EMC test build - HD/DG run separately but connected, HD pumps toggle on/off w/ stop button
+    #define ALARMS_DEBUG                    1           // triggered alarms sent to debug UART
 
     #include <stdio.h>
     #include <strings.h>