Show discount code usage

I may be missing it, but is it possible to see when a particular discount code has been used?

I created a code which I gave to a few contacts, and have had a booking from one, but I’m not sure if they used the code or not. Either they forgot (possible) or they used it and this doesn’t show either on the code page, or in the invoice details I received.

It would be nice to see if codes that you’ve handed out have actually been effective or not (not just from the bookings, but from the usage).

Does this happen, or could it?