diff --git a/docs/SARaudio.m b/docs/SARaudio.m
index 9b00aae1fe4da0eafba7d8a72ebefd904e832409..28e59d40592b318af888a645bb8b23c18e6fa805 100644
--- a/docs/SARaudio.m
+++ b/docs/SARaudio.m
@@ -332,7 +332,7 @@ audiowrite('guitare_reverberee.wav', w, fe);
 
 fe = 44100;
 f0 = 440;
-
+D=100/f0
 t = linspace(0, D, D*fe);
 
 function y = effet_reverb_FFT(x, h)