Add store to my sitemap?

[weddingdayessentials]

Hi,

 

I have just looked at my sitemap and realised my online store is not shown in my sitemap which i have submitted to google.

 

Is there a simple way to add my store to my current sitemap??

 

Thanks

 

my sitemap is at www.weddingdayessentials.co.uk/sitemap.xls

 

Thanks