Index: firmware/App/Services/FPGA.c
===================================================================
diff -u -rfa27f8d2dba32416ff6b310b192b9adb5fee6997 -rce596a29a2bd6384d70b2fe7b9c332b0f1f37a84
--- firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision fa27f8d2dba32416ff6b310b192b9adb5fee6997)
+++ firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision ce596a29a2bd6384d70b2fe7b9c332b0f1f37a84)
@@ -100,8 +100,8 @@
 #define FPGA_PBO_TEMP_OFFSET            50.0                    ///< Used in conversion of PBo temperature reading to deg C.
 
 #define FPGA_ALARM_AUDIO_VOLUME_SHIFT   3                       ///< Shift alarm audio volume 3 bits to left before writing to register.
-#define FRONT_DOOR_SWITCH_MASK          0x0010                  ///< Front door switch bit mask.
-#define PUMP_TRACK_SWITCH_MASK          0x0020                  ///< Pump track switch bit mask.
+#define FRONT_DOOR_SWITCH_MASK          0x0010                  ///< Front door switch bit mask. Bit 4 of the GPIO register.
+#define PUMP_TRACK_SWITCH_MASK          0x0020                  ///< Pump track switch bit mask. Bit 5 of the GPIO register.
 
 // FPGA Sensors Record
 #pragma pack(push,1)