Added link to the RubyGems User's Guide

railties/guides/source/getting_started.textile

@@ -20,6 +20,7 @@ This guide is designed for beginners who want to get started with a Rails applic
 TIP: Note that Ruby 1.8.7 p248 and p249 have marshaling bugs that crash Rails 3.0. Ruby Enterprise Edition have these fixed since release 1.8.7-2010.02 though. On the 1.9 front, Ruby 1.9.1 is not usable because it outright segfaults on Rails 3.0, so if you want to use Rails 3 with 1.9.x jump on 1.9.2 for smooth sailing.
 
 * The "RubyGems":http://rubyforge.org/frs/?group_id=126 packaging system
+  ** If you want to learn more about RubyGems, please read the "RubyGems User Guide":http://docs.rubygems.org/read/book/1
 * A working installation of the "SQLite3 Database":http://www.sqlite.org
 
 Rails is a web application framework running on the Ruby programming language. If you have no prior experience with Ruby, you will find a very steep learning curve diving straight into Rails. There are some good free resources on the internet for learning Ruby, including: