rails console エラー

$ rails console
/usr/local/lib/ruby/1.9.1/irb/completion.rb:9:in `require': cannot load such file -- readline (LoadError)
from /usr/local/lib/ruby/1.9.1/irb/completion.rb:9:in `<top (required)>'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.12/lib/rails/commands/console.rb:3:in `require'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.12/lib/rails/commands/console.rb:3:in `<top (required)>'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.12/lib/rails/commands.rb:38:in `require'
from /usr/local/lib/ruby/gems/1.9.1/gems/railties-3.2.12/lib/rails/commands.rb:38:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
#readlineがないのでinstallする
sudo yum install libreadline

#Gemfile編集
gem 'rb-readline' #を追加
$bundle install
Installing rb-readline (0.4.2)
#↑が出てくる
#もう一度
$rails console
#成功