Thing To Write In A Wedding Card What To Write In A Wedding Card -- If I'm Not Going To The Wedding?

What to write in a wedding card -- if I'm not going to the wedding? - thing to write in a wedding card

My friend is a wedding next week. He and the couple are friends since we were kids. The couple had one years ago, when he returned home after graduating from university. The wedding is all over the country - so it will not - but I bought a ticket. I wonder what I should write on the card? What is the ettiquite "good" for this kind of problem? I do not know too well - but I mean more than just congratulations.