You could - there's nothing wrong with it. I probably wouldn't, though. It's an optional comma, and so what looks right depends almost entirely on the preferences of the writer. If this were my letter, I wouldn't want readers to take that little pause between develop and both, which is why I'd leave the comma out. But if you want your reader to take a little mental pause there, you should leave it in.
(Cross-posted with Owlman)