A header assembly for mounting upon a front end of a harvester combine's feeder house, the header assembly incorporating a central header which is adapted for fixed attachment to the feeder house front end; the header assembly further incorporating a lateral header and a pivot joint positioning an oppositely lateral end of the lateral header over the lateral end of the central header, the pivot joint being adapted for facilitating movements of the lateral header between a mowing position and a transport position, the lateral header cantilevering laterally over a crop edge upon pivoting to the mowing position and extending rearwardly upon counter-pivoting to the transport position.
