From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 31 Jul 2014 13:44:05 +0200
From: Carsten Kunze <carsten.kunze@arcor.de>
To: 9fans@9fans.net
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Subject: Re: [9fans] troff documentation link broken
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> Please correct me if I'm wrong, but I don't think there's
> any bug here :
>
> The .ul internal command draw an underline when possible,
> and use italics when it's not possible. For example, on a
> terminal without underlining capabilities, italics are used.
>
> .us is just an example of an handmade underlining
> macro, which is not expected to be implemented in all the
> macro sets.

The whole paragraph does not make sense if .ul is used.  Why defining .us and not using it.  This is a typo.  troff doesn't underline by itself.  One way is to write a custom macro (as .us) or use ms macro's .UL.  .ul only underlines in nroff.

Cheers,
Carsten