# File lib/formtastic-bootstrap/inputs/radio_input.rb, line 17
      def wrapper_html_options
        # Formtastic marks these as 'radio' but Bootstrap does something
        # with that, so change it to 'radio_buttons'.
        super.tap do |options|
          options[:class] = options[:class].gsub("radio", "radio_buttons")
        end
      end