Spell check the filters troff/nroff commands?

It happens that I still use the original Unix markup language, troff with
commands that start with a dot on at the beginning of a line, or ocmes that
start with a backslash, e.g., .ce for center or \fB for font bold.

Being new at the spell checker, how can I arrange for the spell cheker to skip
these troff commands and not report them as misspelled words? There are
hundreds of such commands, which include arguments .e.g, .in 4n or .sp 5v.

Aspell used to filter out such commands withe hte -n option, but at least for
the PC aspell now only includes filters for LaTex, html, etc.

Thanks for any tips.

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