diff --git a/libraries/AP_Airspeed/models/ADS_cal_EKF.m b/libraries/AP_Airspeed/models/ADS_cal_EKF.m
index ee7667e321..5e18472dc7 100644
--- a/libraries/AP_Airspeed/models/ADS_cal_EKF.m
+++ b/libraries/AP_Airspeed/models/ADS_cal_EKF.m
@@ -37,7 +37,7 @@ for i = 1:1000
     
     %% Calculate truth values
     % calculate ground velocity by simulating a wind relative
-    % circular path of of 60m radius and 16 m/s airspeed
+    % circular path of 60m radius and 16 m/s airspeed
     time = i*DT;
     radius = 60;
     TAS_truth = 16;