In You should have done this and that..
I make it clear that "Having to ask questions" is "not-so luxurious". If a button doesn't say what the button does it's not a luxurious button at all. If the end user target audience or customer (or who ever your making this thing with the button on it for) needs to ask questions about it's use, it's user unfriendly and not properly documented. A chance to improve things! Read_more>>