diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index d924314d6a..6430ec81cb 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -32,6 +32,7 @@
 
 // features below are disabled by default
 //#define SPRAYER               ENABLED             // enable the crop sprayer feature (two ESC controlled pumps the speed of which depends upon the vehicle's horizontal velocity)
+//#define EPM_ENABLED           ENABLED             // enable epm cargo gripper costs 500bytes of flash
 
 // redefine size of throttle deadband in pwm (0 ~ 1000)
 //#define THROTTLE_IN_DEADBAND   100