These are the epydoc fields used in twisted::

    {'@arg': 4,
     '@author': 40,
     '@cvar': 27,
     '@ivar': 242,
     '@note': 5,
     '@param': 912,
     '@raise': 56,
     '@raises': 10,
     '@return': 245,
     '@returns': 68,
     '@returntype': 31,
     '@rtype': 187,
     '@see': 5,
     '@seealso': 3,
     '@type': 705,
     '@var': 1}

Quite a few of the above are synonyms, so it's these that require
actual support::

    @author
    @cvar
    @ivar
    @note
    @param (synonym: @arg)
    @raise (synonym: @raises)
    @return (synonym: @returns)
    @rtype (synonym: @returntype)
    @see (synonym: @seealso)
    @type
    @var