Does groff permit characters besides hyphen-minus (ASCII 45) and soft hyphen (octal 255) for displaying hyphenation in man pages? I'm asking because the Emacs package man.el displays references to other man pages (e.g. in the SEE ALSO section) as clickable links, but has a bug when such a reference is hyphenated, and in trying to fix this bug the above question arose (see http://lists.gnu.org/archive/html/bug-gnu-emacs/2016-05/msg01358.html). I'd be grateful for a definitive answer or at least a pointer to relevant documentation.
Thanks, Steve Berman
