# Updating Google sitemap for mobile

I have a series of utilities to generate Google sitemaps for my whole site. These files are massive, and slow to build. We want to start telling Google these pages are mobile-crawl-able too, by adding them to mobile sitemaps, but the documentation is unclear if I need to specify physically different files for my mobile URLs than for my normal ones.

If this is my current sitemap:

<?xml version="1.0" encoding="UTF-8" ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://mobile.example.com/article100.html</loc>
</url>
</urlset>


Can I simply change it to:

<?xml version="1.0" encoding="UTF-8" ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
<url>
<loc>http://mobile.example.com/article100.html</loc>
<mobile:mobile/>
</url>
</urlset>


Or do I need to create new files with the additional markup, alongside my existing files?

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