rdoc and the "--accessor" option

Question

rdoc --help says:

--accessor, -A accessorname[,..]
    comma separated list of additional class methods
    that should be treated like 'attr_reader' and
    friends. Option may be repeated. Each accessorname
    may have '=text' appended, in which case that text
    appears where the r/w/rw appears for normal accessors.

Does anyone have any working examples of doing this (both the accessor method definition and the rdoc command invocation)? No matter what combination I try, my accessors will not show up in the RDoc output.

Thanks.