gadget testing link

diff --git a/README b/README
index 6cec2d5..811acfd 100644 (file)
--- a/README
+++ b/README
@@ -7,6 +7,8 @@ https://github.com/ckuethe/usbarmory/wiki/USB-Gadgets
 
 http://github.com/wismna/raspberry-pi/hackpi
 
+https://github.com/torvalds/linux/blob/master/Documentation/usb/gadget-testing.txt
+
 
 This setup has been tested on Raspberry Pi 0 and Allwinner A20 based board.