Faith Kipyegon ran a mile in 4 minutes, 6.42 seconds — more than a second faster than her world record — at “Breaking4,” a special event billed as Kipyegon’s attempt to become the first woman to run a mile in under four minutes. Video of Kipyegon’s mile is here.

Kipyegon’s time initially read as 4:06.91, but was later adjusted to 4:06.42. Nike has explained what happened.