For ages, theme authors have been adding code like this to their theme’s header.php files:
<link rel="alternate" type="application/rss+xml" title="<?php bloginfo('name'); ?> RSS Feed" href="<?php bloginfo('rss2_url'); ?>" />
No need for that any more. Remove that stuff, make sure you’ve got the wp_head() call in the header (like you should anyway), then add this to the theme’s functions.php file instead:
add_theme_support( 'automatic-feed-links' );
This automatically adds the relevant feed links everywhere on the whole site. Standard feed, comments links, category and tag archives, everything as it should be.