Editing Chain crew (section)

===5-yard mark===
Before the game, many linesmen attach a piece of tape at the midpoint of the chain.<ref>{{Cite web
|url=http://skipharrison.com/Sports/ChainGang3.html
|title=Chain Gang
|author=Skip Harrison
|access-date=December 2, 2016}}</ref> The linesman can compare the line of scrimmage to this mark at the start of a play and know whether a 5-yard penalty against the defense will result in a first down. If so, the linesman's typical hand signal to the line judge across the field is to extend the arms with the thumbs pointing toward one another. Such a gesture with thumbs pointing away signals that there are more than 5 yards to gain.<ref>{{Cite web
|url=https://mafiadoc.com/2015-aia-football-officiating-mechanics-manual_59c2b4eb1723dd3c81fd7687.html
|title=2015 AIA Football Officiating Mechanics Manual
|publisher=AIA
|date=July 24, 2015}}</ref>{{Rp|6.10.1}}
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