You should let your family know your wishes, and write it down.
I can't stress this enough to people who want to become voluntary organ donor . Agreeing to donate your organs and having it on your license will
not make you an instant donor. It may sound odd, but you are assumed to not be a donor (even with it on your license) unless the family member/person responsible represents/knows your wishes.
I've always though this was a bit backwards and feel people should automatically become donors unless they let their objections be known. Imagine how many donors we would have!