أعط أجوبة - 한국어

صوّت الآندون الإجابةسؤال لغوي بمعني (سؤال في اللغه المقصوده)
What means 도에?

I wrote a text with 2013년 and someone changed it to     2013년도에. What is the meaning of it?

PS: Check out these free Korean learning resources: Teaching session: Korean Folk Villages — Negation — Means of Transportation — Food