README.md in navigator-0.4.0 vs README.md in navigator-0.5.0

@@ -13,20 +13,23 @@
 * Supports the following HTML tags: ul, li, a, b, em, s, small, span, strong, sub, and sup.
 * Provides the "item" convenience method which combines the "li" and "a" HTML tags into a single method for less typing.
 
 # Requirements
 
-0. [Ruby 2.x.x](http://www.ruby-lang.org).
+0. Any of the following Ruby VMs:
+    * [MRI 2.x.x](http://www.ruby-lang.org)
+    * [JRuby 1.x.x](http://jruby.org)
+    * [Rubinius 2.x.x](http://rubini.us)
 0. [Ruby on Rails 4.x.x](http://rubyonrails.org).
 
 # Setup
 
-Type the following from the command line to securely install (recommended):
+For a secure install, type the following from the command line (recommended):
 
     gem cert --add <(curl -Ls http://www.redalchemist.com/gem-public.pem)
     gem install navigator -P HighSecurity
 
-...or type the following to insecurely install (not recommended):
+...or, for an insecure install, type the following (not recommended):
 
     gem install navigator
 
 Add the following to your Gemfile: