While I don't currently see a point in supporting MMDF, we'll
still acknowledge it since mutt actually supports it. Expand a
bit on MH while we're at it, since MH seems at least relevant.
=head1 MH
Not yet supported, locking semantics (or lack thereof) appear to
-make it unsuitable for parallel access.
+make it unsuitable for parallel access. It is widely-supported
+by a variety of MUAs and mailing list managers, however.
+
+=head1 MMDF
+
+Not yet supported, and it's unclear if current usage/support makes
+it worth supporting.
=head1 IMAP
$xurls{'cgitrc(5)'} = 'https://git.zx2c4.com/cgit/tree/cgitrc.5.txt';
$xurls{'prove(1)'} = 'https://perldoc.perl.org/prove.html';
$xurls{'mbox(5)'} = 'https://manpages.debian.org/stable/mutt/mbox.5.en.html';
+$xurls{'mmdf(5)'} = 'https://manpages.debian.org/stable/mutt/mmdf.5.en.html';
my $str = do { local $/; <STDIN> };
my ($title) = ($str =~ /\A([^\n]+)/);