Merge pull request #20734 from srikanthps/master

To fix #20644

guides/source/getting_started.md

@@ -23,7 +23,8 @@ application from scratch. It does not assume that you have any prior experience
 with Rails. However, to get the most out of it, you need to have some
 prerequisites installed:
 
-* The [Ruby](https://www.ruby-lang.org/en/downloads) language version 2.2.2 or newer.
+* The [Ruby](https://www.ruby-lang.org/en/downloads) language version 2.2.2 or newer. 
+* Right version of [Development Kit](http://rubyinstaller.org/downloads/), if you are using Windows
 * The [RubyGems](https://rubygems.org) packaging system, which is installed with Ruby
   versions 1.9 and later. To learn more about RubyGems, please read the [RubyGems Guides](http://guides.rubygems.org).
 * A working installation of the [SQLite3 Database](https://www.sqlite.org).