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When was the diaulos race added to the ancient Olympic Games?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

The diaulos, a two-length footrace in the ancient Olympic Games, was added to the competition in 724 BCE. This race required contestants to run down one side of the stadium, turn around a goal, and return to the starting point, covering a distance roughly similar to a modern 400-meter race.12