i think it's good that it makes you type it as it quickly becomes a habit and you need the practice when you first start erlang. However, perhaps he can put a

i think it's good that it makes you type it as it quickly becomes a habit and you need the practice when you first start erlang. However, perhaps he can put a big floating arrow pointing left that just sits there saying "DONT FORGET THE PERIOD" as soon as you hit enter without a period.