README.md in nsrr-0.1.0.beta4 vs README.md in nsrr-0.1.0.beta5

@@ -6,24 +6,29 @@
 
 The official ruby gem built to simplify file downloads and dataset integration tasks for the [National Sleep Research Resource](https://sleepdata.org).
 
 ## Prerequisites
 
-You must have [Ruby 2.0+ installed](https://github.com/remomueller/documentation/) on your system to use the NSRR gem.
+You must have **Ruby 2.0+ installed** on your system to use the NSRR gem.
 
+- [Install Ruby on Windows](http://rubyinstaller.org/)
+- [Install Ruby on Mac](https://github.com/remomueller/documentation/blob/master/macosx/140-install-ruby.md)
+- [Install Ruby on Linux (CentOS)](https://github.com/remomueller/documentation/blob/master/centos/140-install-ruby.md)
+
 ## Installation
 
-Add this line to your application's Gemfile:
+Install it yourself as:
 
+    $ gem install nsrr --pre --no-ri --no-rdoc
+
+Or add this line to your application's Gemfile:
+
     gem 'nsrr'
 
 And then execute:
 
     $ bundle
 
-Or install it yourself as:
-
-    $ gem install nsrr
 
 ## Usage
 
 ### Download files from a dataset