diff --git a/ArduPlane/config.h b/ArduPlane/config.h
index 3112585a14..87bf4d639c 100644
--- a/ArduPlane/config.h
+++ b/ArduPlane/config.h
@@ -228,12 +228,17 @@
 # define LOW_VOLTAGE			9.6
 #endif
 #ifndef VOLT_DIV_RATIO
-# define VOLT_DIV_RATIO			3.56
+# define VOLT_DIV_RATIO			3.56	// This is the proper value for an on-board APM1 voltage divider with a 3.9kOhm resistor
+//# define VOLT_DIV_RATIO		15.70	// This is the proper value for the AttoPilot 50V/90A sensor
+//# define VOLT_DIV_RATIO		4.127	// This is the proper value for the AttoPilot 13.6V/45A sensor
+
 #endif
 
 #ifndef CURR_AMP_PER_VOLT
-# define CURR_AMP_PER_VOLT		27.32
+# define CURR_AMP_PER_VOLT		27.32	// This is the proper value for the AttoPilot 50V/90A sensor
+//# define CURR_AMP_PER_VOLT	13.66	// This is the proper value for the AttoPilot 13.6V/45A sensor
 #endif
+
 #ifndef CURR_AMPS_OFFSET
 # define CURR_AMPS_OFFSET		0.0
 #endif