Where/how to give the product description its own css class?

On product listing pages, the product description doesn't have its own css class.

The product name does (.mp_product_name), the meta and buy now areas do (.mp_product_meta), and there is one for the product overall (.mp_product); but the product description doesn't have one.

I've struggled with this before, but it would be a useful addition. Where in the thousands of lines of marketpress code do I add a <div> tag to set up something like .mp_product_desc for the product listing pages?