diff --git a/Variant-HOVERBOARD.md b/Variant-HOVERBOARD.md
index 091b877..78ce84e 100644
--- a/Variant-HOVERBOARD.md
+++ b/Variant-HOVERBOARD.md
@@ -1 +1,7 @@
-⚠️ Not implemented yet ⚠️
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+⚠️ Not implemented yet ⚠️
+
+The balancing part of the FOC firmware has not been implemented.<br>
+There is a firmware for sideboards with [GD](https://github.com/EFeru/hoverboard-sideboard-hack-GD) and [STM](https://github.com/EFeru/hoverboard-sideboard-hack-STM) chips, but it's only supporting the DMP on MPU6050 IMU for Angle calculation.<br>
+Many sideboards have a different IMU like MPU6050A, which is in fact a ICM-20689.<br>
+
+The [Bipropellant](https://github.com/bipropellant) firmware handles the different protocols of the stock sideboard firmwares but it's not supporting FOC motor control. 
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