When I use pry:
$ pry --version
Pry version 0.9.12 on Ruby 1.9.3
$ pry
[1] pry(main)> ri String
# shows String documentation
[2] pry(main)> ri String.split
error: 'String.split' not found
[3] pry(main)> ri String.strip
String.strip not found, maybe you meant:
String#strip_heredoc
What should I do to make the documentation appear?
Well, there are no methods String.split or String.strip. There are, however, methods String#split and String#strip. Try asking for those, and you'll probably get their documentation.
