The `gem man` command can be used to display a man page for an installed RubyGem. The man page must be included with the gem - `gem-man` does no generation or magic. For an introduction to man pages, see `man(1)` (or type `man man` in your shell).
Gemfile gem 'gem-man', '~> 0.1.2'
install gem install gem-man -v 0.1.2