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< 		<title>by: <?php comment_author_rss() ?></title>
---
> 		<title><?php if ( (! is_single()) || (! is_page()) ) {
> 			$title = get_the_title($comment->comment_post_ID);
> 			$title = apply_filters('the_title', $title);
> 			$title = apply_filters('the_title_rss', $title);
> 			echo "Comment on $title";
> 		} ?> by: <?php comment_author_rss() ?></title>