You'll be alright. Koichi won't fire you without prior notice.
I left my rent unpaid for three months and then I was given an eviction notice.
A letter giving advance notice for a murder arrived at the Tofugu office.
If you announce something beforehand you will have advance notice. Advance notice is always nice to give.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.