How do I add a custom link to the sitemap? It's not a post or a page or a category or a custom post type. It's outside of WordPress - sits alongside it. It's a custom built PHP/JavaScript calculator. So Wordpress = wp-admin, wp-content, wp-includes directories and the calculator = calculator directory alongside those. So how do I ask Search Engines to be aware of that and add it to the sitemap (e.g. site.com/calculator/ )?
Thank you.