Home Depot

(HD) - Get Report

said the U.S. attorney for the Southern District of New York has joined a probe of the company's stock option practices.

The Atlanta-based home improvement retailer made the statement in a regulatory filing Wednesday. Home Depot said in June that the

Securities and Exchange Commission

was examining possible backdating at Home Depot. The company had earlier disclosed it found $10 million in unrecorded stock option expense.

Home Depot said it will cooperate with the requests for information.