Having requested e-signatures returned to more than one party.

I would like to have documents that I send out using the "Request e-signature" feature to be able to be returned (signed) to not only myself, but to my supervisor as well.  Currently the Cc field that I am using results in the Cc'd party being asked to also sign the document.  How do I make it so when the recipient signs the document, it comes back to more than one person?  This would avoid me having to forward signed documents all the time.