From 70c5797a94b105db9fb6adeb29a4315eb82292a5 Mon Sep 17 00:00:00 2001
From: Qinghao Shi <Qinghao.Shi@arm.com>
Date: Mon, 24 Feb 2020 12:25:38 +0000
Subject: [PATCH] TEST: update usb test README

---
 TESTS/usb_device/README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/TESTS/usb_device/README.md b/TESTS/usb_device/README.md
index f1d3bc8c90..38f6bdbeab 100644
--- a/TESTS/usb_device/README.md
+++ b/TESTS/usb_device/README.md
@@ -68,9 +68,9 @@ No setup method has been verified for this platform.
 
 ## Running tests
 1.  Plug both USB interfaces (*DAPLink* and *USB device*) to your host machine.
-1.  Run tests:
+1. An addtional macro `USB_DEVICE_TESTS` is needed to be defined when runing tests:
     ```
-    mbed test -t <toolchain> -m <target> -n tests-usb_device-*
+    mbed test -t <toolchain> -m <target> -DUSB_DEVICE_TESTS -n tests-usb_device-*
     ```
 
 ## Known issues