diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index c554e2ec4c..712ba0ce7f 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -1188,7 +1188,7 @@ static void one_hz_loop()
 #endif
 }
 
-// called at 100hz but data from sensor only arrives at 10 Hz
+// called at 10hz
 #if OPTFLOW == ENABLED
 static void update_optical_flow(void)
 {