diff --git a/libraries/APM_Control/AR_AttitudeControl.h b/libraries/APM_Control/AR_AttitudeControl.h
index d3e27b18be..3303007555 100644
--- a/libraries/APM_Control/AR_AttitudeControl.h
+++ b/libraries/APM_Control/AR_AttitudeControl.h
@@ -45,7 +45,7 @@ public:
     // positive lateral acceleration is to the right.
     float get_steering_out_lat_accel(float desired_accel, bool skid_steering, bool motor_limit_left, bool motor_limit_right, bool reversed);
 
-    // return a steering servo output from -1 to +1 given a yaw error in radians
+    // return a steering servo output from -1 to +1 given an angle error in radians
     float get_steering_out_angle_error(float angle_err, bool skid_steering, bool motor_limit_left, bool motor_limit_right, bool reversed);
 
     // return a steering servo output from -1 to +1 given a