The comment_link filter provides the ability to alter the links to post comments in the RSS feed.
When the 'comment_link' filter is called, it is passed one parameters: the link.
add_filter( 'comment_link', 'filter_function_name', 10, 3 );
function filter_function_name( $link) {
// Manipulate comment link
return $link;
}
Where 'filter_function_name' is the function WordPress should call when filter is run. Note that the filter function must return an value after it is finished processing or the result will be empty.
filter_function_name should be unique function name. It cannot match any other function name already declared.