<title><?php
if ( !is_singular() ) {
$title = get_the_title($comment_post->ID);
- $title = apply_filters('the_title_rss', $title);
+ /** This filter is documented in wp-includes/feed.php */
+ $title = apply_filters( 'the_title_rss', $title );
printf(ent2ncr(__('Comment on %1$s by %2$s')), $title, get_comment_author_rss());
} else {
printf(ent2ncr(__('By: %s')), get_comment_author_rss());