diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index f634fa101f..bc2cbc74b5 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -63,11 +63,29 @@
 // Ensure the defined file exists and is in the arducopter directory
 #define USERHOOK_VARIABLES "UserVariables.h"
 
-
 // to enable, set to 1
 // to disable, set to 0
 #define AUTO_THROTTLE_HOLD 1
 
+//# define LOGGING_ENABLED		DISABLED
 
 
-//# define LOGGING_ENABLED		DISABLED
\ No newline at end of file
+// Custom channel config - Expert Use Only.
+// this for defining your own MOT_n to CH_n mapping.
+// Overrides defaults (for APM1 or APM2) found in config_channels.h
+// MOT_n variables are used by the Frame mixing code. You must define
+// MOT_1 through MOT_m where m is the number of motors on your frame.
+// CH_n variables are used for RC output. These can be CH_1 through CH_8,
+// and CH_10 or CH_12. 
+// Sample channel config. Must define all MOT_ chanels used by
+// your FRAME_TYPE.
+// #define CONFIG_CHANNELS CHANNEL_CONFIG_CUSTOM
+// #define MOT_1 CH_6
+// #define MOT_2 CH_3
+// #define MOT_3 CH_2
+// #define MOT_4 CH_5
+// #define MOT_5 CH_1
+// #define MOT_6 CH_4
+// #define MOT_7 CH_7
+// #define MOT_8 CH_8
+