WordPress at a glance
filter is not described

the_feed_link filter-hook . WP 3.0.0

Filters the feed link anchor tag.

Usage

add_filter( 'the_feed_link', 'filter_function_name_3895', 10, 2 );
function filter_function_name_3895( $link, $feed ){
	// filter...

	return $link;
}
$link(string)
The complete anchor tag for a feed link.
$feed(string)
The feed type, or an empty string for the default feed type.

Where the hook is called

the_feed_link()
wp-includes/link-template.php 574
echo apply_filters( 'the_feed_link', $link, $feed );

Where the hook is used (in WP core)

Does not used.