Me : so here is your quote for the app

Client : oh yer and it needs to work in both android and iOS, that's not a big deal right?

Me : of course not, however I am going to have to add a little something to your quote!

I don't get how when I ask a client if I got everything right so I can draft up a quote, they don't think to mention stuff like other features they had an idea for or cross platforms they wanted but didn't say in the original proposal -_-