diff --git a/Input-Calibration.md b/Input-Calibration.md
index 7116af5..358da6f 100644
--- a/Input-Calibration.md
+++ b/Input-Calibration.md
@@ -4,7 +4,7 @@ Input Calibration is required to identify:
 * the middle value (e.g center of the joystick) for mid-resting pots
 
 At startup, for safety reasons, the firmware won't enable the motors if the input is not very small (between -50 and 50).<br>
-If you don't hear a single beep after the Power On melody, it means the motors are not enabled as they would start to spin otherwise.<br>
+If you don't hear a double beep after the Power On melody, it means the motors are not enabled as they would start to spin otherwise.<br>
 You need to calibrate your inputs either manually or with the auto-calibration.<br>