diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index b9e1153450..c11aac04c6 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -54,7 +54,7 @@
 
 // Inertia based contollers.  disabled by default, work in progress
 //#define ACCEL_ALT_HOLD 0
-//#define INERTIAL_NAV DISABLED
+//#define INERTIAL_NAV ENABLED
 
 
 #if INERTIAL_NAV == ENABLED