Hello! FH is finishing designing our wedding invitations, but I am unsure about the RSVP's. We are doing online RSVP's only and therefore are not planning on sending a separate card for them. Do we put a note on the back of the wedding invitations or should we still order some type of extra card? It just seems wasteful to me if people aren't going to be mailing them back, but curious on what others are doing.