diff --git a/README.md b/README.md
index b8ff761..c53a78c 100644
--- a/README.md
+++ b/README.md
@@ -38,4 +38,4 @@ Prerequisites
   
 * Look at lsusb output and make sure that your reader is present in 42-pn53x.rules
 * Install appropriate driver for your NFC reader (if required)
-* Reboot your system
+* If your reader is plugged in unplug it and plug it again. If you run example below and get "Device or resource busy" error then you need to reboot your system before you can continue.