What does supplementing mean?
Answer: Supplementing means entering a horse for a race at a late stage. This usually involves a fee being paid to allow the horse to participate.
Many high class races necessitate early registration which means a trainer may not know he has a potential runner on his hands until near the date of the race.
One example was the supplementing of Kingston Hill for the Racing Post Trophy in October 2013 which cost the owner Paul Smith a fee of £17,500.
Just 2 weeks before the Group 1 race Kingston Hill had won the Group 3 Autumn Stakes at Newmarket in taking fashion and his trainer, Roger Varian, was confident there was more to come.
Kingston Hill justified the supplement by winning the £149,000 first prize as the 7/2 favourite.