# File lib/nanoc3/cli/commands/update.rb, line 34
    def option_definitions
      [
        # --vcs
        {
          :long => 'vcs', :short => 'c', :argument => :required,
          :desc => 'select the VCS to use'
        },
        # --yes
        {
          :long => 'yes', :short => 'y', :argument => :forbidden,
          :desc => 'updates the data without warning'
        }
      ]
    end