diff --git a/hid_descriptors.txt b/hid_descriptors.txt
index 27ad822..8419593 100644
--- a/hid_descriptors.txt
+++ b/hid_descriptors.txt
@@ -1,3 +1,5 @@
+https://github.com/arduino/Arduino/blob/da9641410a4b8fa0865f0a31d0b884d14f5e7670/hardware/arduino/avr/cores/arduino/HID.cpp
+
 05 01 // Usage page Generic desktop
 09 02 // Usage Mouse