<?php

function add_listing_page_rewrites()
{
    global $wp_rewrite;

    add_rewrite_endpoint('articles', EP_PERMALINK);
    add_rewrite_rule('^(.+)/articles', 'index.php?category_name=$matches[1]&articles_list=1', 'top');

    flush_rewrite_rules();

}

add_action('init', 'add_listing_page_rewrites');

?>