diff --git a/Variant-Nunchuk.md b/Variant-Nunchuk.md
index a826437..e02dbfd 100644
--- a/Variant-Nunchuk.md
+++ b/Variant-Nunchuk.md
@@ -11,6 +11,7 @@ This variant can be used with Wii Nunchuk (not the Wiimote).
 ⚠ Red wire from sensor cable delivers 15v !!!
 Use 3.3v from programming port or a voltage regulator.
 
+## Calibration:
 Proceed with [calibration](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Calibration) for better control.
 
 ## Troubleshooting: