[APG]

Here is the wording of the rule for those wondering:

Rule 9, Section 1

DEFENSIVE TEAM FORMATION
Article 3: Defensive Team Formation

(a) When Team A presents a punt, field-goal, or Try Kick formation, a Team B player, who is within one yard of the line of scrimmage, must have his entire body outside the snapper’s shoulder pads at the snap.

(b) When Team A presents a field-goal or Try Kick formation:

(1) No more than six Team B players may be on the line of scrimmage on either side of the snapper at the snap; and

Note: These restrictions do not apply if a team does not present a standard punt, field goal, or Try Kick formation (an equal number of players on the line of scrimmage on either side of the snapper in a tight formation), or if, after the offensive team has assumed a set position, there is a shift, or a player goes in motion.