MULTI-CHAMBER CURTAIN AIRBAG

An assembly for a vehicle includes a roof and a headliner. The vehicle includes a seat having an occupant seating area. The vehicle includes a curtain airbag. The curtain airbag includes an extension. The curtain airbag is inflatable from an uninflated position to an inflated position. The curtain airbag is between the roof and the headliner in the uninflated position. The curtain airbag is inflatable downwardly from the headliner to the inflated position. In the inflated position, the curtain airbag has a main chamber and the extension extending cross-vehicle from the main chamber and vehicle-forward of the occupant seating area.