Six months have passed since
Now his penalty has ended and he is ready to swim again.
Phelps will headline an Arena Pro Swim Series meet in Arizona later this month. He chose the same meet to end his retirement last spring.
"My suspension is finally up!" he wrote on Twitter. "Time to get back in the pool and race again!"
Phelps was arrested in Baltimore last October and, after pleading guilty, was given 18 months of probation.
As part of his swimming suspension, he was removed from the American team that will travel to the world championships in Russia next summer. Officials have left open the option of placing him back on that roster.