diff --git a/HID-lights.md b/HID-lights.md
index c305d90..9134ebf 100644
--- a/HID-lights.md
+++ b/HID-lights.md
@@ -14,6 +14,8 @@ Launch `spice.exe -cfg -sysdump all` to show a dump of HID devices detected by s
 
 ## Sample code
 
+[Arduino-HID-Lighting](https://github.com/mon/Arduino-HID-Lighting) - read this first.
+
 Arduino code in [UltimatePopnController](https://github.com/CrazyRedMachine/UltimatePopnController/blob/master/popnController/POPNHID.cpp)
 
 Arcin code in [arcin-infinitas](https://github.com/kinetic-flow/arcin-infinitas/blob/master/arcin/report_desc.h)