diff --git a/keyboard/onekey/VUSB.md b/keyboard/onekey/VUSB.md
index 0cf18c0f21..8af31f6f20 100644
--- a/keyboard/onekey/VUSB.md
+++ b/keyboard/onekey/VUSB.md
@@ -61,3 +61,8 @@ Add settings for calibration in usbconfig.h
       */
     -#define USB_CFG_HAVE_MEASURE_FRAME_LENGTH   0
     +#define USB_CFG_HAVE_MEASURE_FRAME_LENGTH   1
+
+
+Another calibration code
+========================
+https://github.com/obdev/v-usb/tree/master/libs-device