Just checked the rules, apparently it's not writed.
I just saw lots of players doing it, while I find it really interresting to not do it: you can often tell you think it's good depending of what you move and where you put your hint, and if you draw one more card or not (and sometimes by what you check).
I just saw lots of players doing it, while I find it really interresting to not do it: you can often tell you think it's good depending of what you move and where you put your hint, and if you draw one more card or not (and sometimes by what you check).