Newbie chain clip question

[PocketSidewalk]

I'm a new official and have a quick question (I hope).

I understand the reasoning behind clipping the chain. I also understand that it's standard practice to clip the chain on the back of the 5-yard line closest to the back stake (farthest away from the line-to-gain).


My question is, who keeps up with which yard line the chain is clipped at? Does the linesman write this down at the beginning of every new series, or is this duty given to the box (or clip) man?


Thanks in advance guys.