update doc

adafruit · Aug 20, 2018 · 35d9fb0 · 35d9fb0
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@@ -45,6 +45,10 @@ There are two methods that you can use to install this BSP. We highly recommend
     $ pip3 install adafruit-nrfutil --user
 	```
 
+### Drivers
+
+- [SiLabs CP2104 driver](http://www.silabs.com/products/mcu/pages/usbtouartbridgevcpdrivers.aspx) is required for USB to Serial when using with Feather nRF52832
+
 ## Arduino BLE Application Support
 
 This Arduino core contains basic BLE peripheral mode helper classes and an initial peripheral mode