# File rbot/auth.rb, line 146
    def help(topic="")
      case topic
        when "setlevel"
          return "setlevel <command> <level> => Sets required level for <command> to <level> (private addressing only)"
        when "useradd"
          return "useradd <mask> <level> => Add user <mask> at level <level> (private addressing only)"
        when "userdel"
          return "userdel <mask> => Remove user <mask> (private addressing only)"
        when "auth"
          return "auth <masterpw> => Recognise your hostmask as bot master (private addressing only)"
        when "levels"
          return "levels => list commands and their required levels (private addressing only)"
        when "users"
          return "users => list users and their levels (private addressing only)"
        else
          return "Auth module (User authentication) topics: setlevel, useradd, userdel, auth, levels, users"
      end
    end