The capability is there – check it out by adding /comments/feed to the base URL for a WordPress installation (any recent WordPress version – I’m pretty sure it works on any version more recent then 1.5). Now all you have to do is change your theme to offer it to the browser – my theme has this for header.php:


< ?php if (is_single()): ?>
<link rel="alternate" type="application/rss+xml" title="Comments feed" href="< ?php echo comments_rss() ?>" />
< ?php else : ?>
<link rel="alternate" type="application/rss+xml" title="< ?php bloginfo('name'); ?> Comments" href="< ?php bloginfo('comments_rss2_url'); ?>" />
< ?php endif; ?>