Abstract: A system for adjusting tension on fabric panels between two structural members of a fabric panel structure is disclosed. The system includes a rib that extends outwards from the structural members, a first keder rail located adjacent to the rib, a second keder rail located opposite to the rib of the first keder rail, and a fastener that passes through apertures in the first keder rail, the rib, and second keder rail to secure the keder rails against the rib. Preferably, the fastener is adjustable to allow the keder rails to be opened and closed to assist with installing or replacing fabric panels. Alternate embodiments can secure one of the keder rails directly to the structural member without the use of the rib.