diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index b4c13e9814..b11245b759 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -22,9 +22,10 @@
 //#define CLI_ENABLED           DISABLED            // disable the CLI (command-line-interface) to save 21K of flash space
 //#define LOGGING_ENABLED       DISABLED            // disable dataflash logging to save 11K of flash space
 //#define GPS_PROTOCOL          GPS_PROTOCOL_UBLOX  // hard code GPS to Ublox to save 8k of flash
+//#define GPS_PROTOCOL          GPS_PROTOCOL_UBLOX  // hard code GPS to Ublox to save 8k of flash
 //#define GPS_PROTOCOL          GPS_PROTOCOL_MTK19  // hard cdoe GPS to Mediatek to save 10k of flash
 //#define MOUNT                 DISABLED            // disable the camera gimbal to save 8K of flash space
-//#define AUTOTUNE              DISABLED            // disable the auto tune functionality to save 7k of flash
+//#define AUTOTUNE_ENABLED      DISABLED            // disable the auto tune functionality to save 7k of flash
 //#define OPTFLOW               DISABLED            // disable optical flow sensor to save 5K of flash space
 //#define AC_FENCE              DISABLED            // disable fence to save 2k of flash
 //#define CAMERA                DISABLED            // disable camera trigger to save 1k of flash