Here you can specify files or URLs which should be included in the sitemap, but do not belong to your Blog/WordPress.
For example, if your domain is http://www.foo.com and your blog is located on http://www.foo.com/blog you might want to include your homepage at http://www.foo.com
I'm uncertain about this, and I don't want to cause any double entries or anything silly, I have no idea what I'm doing.
I have wordpress installed in "http://site.com/wordpress/", but I have added .htaccess rewrites so it runs from "http://site.com/".
Do I still need to add the root directory in this case or is it only for blogs run from a subdirectory/folder?