diff --git a/Diagnostics.md b/Diagnostics.md
index 75b16ba..3af5ebb 100644
--- a/Diagnostics.md
+++ b/Diagnostics.md
@@ -8,4 +8,6 @@ The errors reported by the board are in the form of audible beeps:
 - **1 beep fast (medium pitch)**: Low battery voltage < 35V
 - **1 beep fast (high pitch)**: Backward spinning motors
 
+Please also note that with `BEEPS_BACKWARD = 1` (default setting) the board also makes a beep when the motors go backwards. If running [hoverserial.ino](/Arduino/hoverserial) from Arduino the backward beeps are normal, unless you intentionally disable them.<br>
+
 For a more detailed troubleshooting you can use [Debug Serial](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Debug-Serial)
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