sitemap for Wordpress

After verification, it is useful to upload a sitemap to WMT in Google. I ran across this thread in WP help section: http://en.forums.wordpress.com/topic/how-do-i-submit-a-sitemap-to-google-for-my-mapped-domain?replies=6 which basically said the the sitemap.xml file is already on your site, just type it into Google. It worked!