diff --git a/ArduCopter/navigation.pde b/ArduCopter/navigation.pde
index 5497368812..901872710d 100644
--- a/ArduCopter/navigation.pde
+++ b/ArduCopter/navigation.pde
@@ -292,7 +292,7 @@ static void update_nav_wp()
             loiter_sum += loiter_delta;
 
             circle_angle += (circle_rate * dTnav);
-            //1° = 0.0174532925 radians
+            //1 degree = 0.0174532925 radians
 
             // wrap
             if (circle_angle > 6.28318531)