Adding "How did you hear about us?" to Checkout

[ZLA]

Has anyone added a simple question and dropdown to the checkout process that determines how the customer heard about the site? I know I could add something which could email the response to us but I was wondering if there was a way to attach the answer to the order somehow.

Would I need to add a custom field / table to do that or is there some field already available?

Thanks.

[mazhar]

you will need to add some custom field to accommodate this information with order.