How do I install the Ruby ri documentation?

Question

I've recently installed Ruby 1.9.1 on Windows 7, and apparently it doesn't come with the standard ri documentation. So when I do 'ri Array', I get:

C:\>ri Array  Nothing known about Array 

Is there a way I can install this documentation so that the above works?

Answer 1

In case people on other platforms need to install their ri docs (like I did). This article gives the why and the how:

http://jstorimer.com/ri.html

The command is:

gem rdoc --all --ri --no-rdoc