Mount Joy added to Racing Post Godolphin today signalled their determination to end the season on a high by supplementing Mount Joy for the Racing Post TrophyThey forked out Stg£15,000 to add the two-year-old to Britain`s last Group One race of the year at Doncaster next Saturday.Mount Joy will be making his debut for the team in the Stg£175,000-added event, having been bought privately out of Barry Hills`s stable after finishing second on his debut in a maiden on the same course in August.It will be a big day for his new owners, who won the one-mile Racing Post Trophy with Medaaly five years ago.For they will have high hopes of success at the Breeders` Cup meeting at Belmont Park in New York that evening, most notably with Fantastic Light and Sakhee.Mount Joy was the only horse supplemented for the Doncaster race.