Abstract: An overhead door reinforcement assembly has a plurality of elongated reinforcing members operatively mounted vertically on the inner surface of the door between the top edge and the bottom edge of each of the several door panels, and a plurality of cap members overlying the adjacent ends of the reinforcing members. Pivot members pivotally connect the cap members to the adjacent ends of the reinforcing members, and this permits pivoting of the panels as the door is moved between open and closed positions, but prevents pivoting of the ends of the reinforcing members in the direction of the cap members to prevent buckling of the associated door in the closed position under externally applied pressure. A disengageable lock member is engaged with the cap members and the ends of the reinforcing members to prevent pivoting of the ends of the reinforcing members away from the cap members to prevent buckling of the door panels.