diff --git a/Firmware-Compatibility.md b/Firmware-Compatibility.md
index 2f1f657..964542b 100644
--- a/Firmware-Compatibility.md
+++ b/Firmware-Compatibility.md
@@ -6,7 +6,7 @@ This firmware is compatible with STM32F103RCT6 and GD32F103RCT6.<br>
 For AT32F403RCT6 or AT32F413RCT7 chips please check following [Firmware](https://github.com/cloidnerux/hoverboard-firmware-hack) 
 
 ## Pin Mapping
-This is the pin mapping this firmware is using, you might have to adapt it to your board variant.
+This is the pin mapping this firmware is using, you might have to adapt it to your board variant in [defines.h](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/blob/master/Inc/defines.h) file
 
 |Port|Pin|
 |---|---|