README.md in rubyserial-0.2.2 vs README.md in rubyserial-0.2.3

- old
+ new
@@ -5,9 +5,10 @@
 Unlike other Ruby serial port implementations, it supports all of the most popular Ruby implementations (MRI, JRuby, & Rubinius) on the most popular operating systems (OSX, Linux, & Windows). And it does not require any native compilation thanks to using RubyFFI [https://github.com/ffi/ffi](https://github.com/ffi/ffi).
 
 The interface to RubySerial should be (mostly) compatible with other Ruby serialport gems, so you should be able to drop in the new gem, change the `require` and use it as a replacement. If not, please let us know so we can address any issues.
 
 [![Build Status](https://travis-ci.org/hybridgroup/rubyserial.svg)](https://travis-ci.org/hybridgroup/rubyserial)
+[![Build status](https://ci.appveyor.com/api/projects/status/946nlaqy4443vb99/branch/master?svg=true)](https://ci.appveyor.com/project/zankich/rubyserial/branch/master)
 
 ## Installation
 
     $ gem install rubyserial