The long-term future of the German Grand Prix remains in the balance, says its promoter, despite its return to the 2016 Formula 1 calendar.
The FIA announced last week that as part of a plan for F1's biggest ever schedule, the German GP would be back after being dropped for this season.
But although the move has been welcomed by those unhappy about F1 losing classic races, Hockenheim boss Georg Seiler says that unless next year's event is a success then the event could still disappear.
"We need a well filled house next year so that Formula 1 has a future," Seiler told the German news agency DPA.
"We must tell the fans: come to the race next year and secure the future of F1 at Hockenheim."
Although this year's German Grand Prix was dropped after Hockenheim could not agree a fee with Bernie Ecclestone, Seiler is 'very optimistic' interest in the 2016 event will be high.
However, he rued the fact that the event got no extra financial support from local or national government.
"It is very sad because F1 is an image carrier all over the world. For other countries it is part of their tourism promotion, money comes from other areas and they can stage the races without problems."