diff --git a/Firmware-Compatibility.md b/Firmware-Compatibility.md
index ee88140..286bd52 100644
--- a/Firmware-Compatibility.md
+++ b/Firmware-Compatibility.md
@@ -26,7 +26,7 @@ This is the pin mapping this firmware is using, you might have to adapt it to yo
 |TX/SCL/PWM|PB10||Right sensor cable|
 |RX/SDA/PWM/PPM/IBUS|PB11||Right sensor cable|
 |LED|PB2||Missing on some of the boards|
-|BUZZER|PA4|PC13|Missing on some of the boards|
+|BUZZER|PA4|PC13|Used for [diagnostic](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Diagnostics) beeps<br>Missing on some of the boards|
 |HALL LEFT U|PB5|||
 |HALL LEFT V|PB6|||
 |HALL LEFT W|PB7|||
@@ -53,8 +53,8 @@ This is the pin mapping this firmware is using, you might have to adapt it to yo
 |RIGHT_V_CUR|PC5||Used to measure phase current for FOC with low-side Mosfet RDSon|
 |DCLINK|PC2|PA1|Used to measure Battery voltage with adc through a voltage divider|
 |OFF|PA5|PC15|Used to maintain the latch on, released to power off|
-|BUTTON|PA1|PB9||
-|CHARGER|PA12|PA11||
+|BUTTON|PA1|PB9|To power on/off<br>To trigger [auto-calibration](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Input-Calibration#auto-calibration)<br>To set current and speed limits [on the go](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Setup-current-and-speed-limits#gear-setting-up-the-current-and-speed-limits-on-the-go)<br>To change cable length on [transpotter](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Variant-TRANSPOTTER#cable-length)|
+|CHARGER|PA12|PA11|Not used in the firmware at the moment|
 
 
 # Other boards