Starting Sept. 6, importers will have to divulge whether their products were rejected from another country before being diverted to the U.S.

The rule has on the books since early July, with a “discretionary enforcement” period. The rule is part of the Food Safety Modernization Act.

The FDA said it will use the information to make more informed decisions on potential risks of imported food. The 2002 Bioterrorism Act resulted in the original prior notice regulation, which required food importers to submit electronic notices to the FDA.

The FDA said it received 10.1 million prior notice of imported food shipments in 2010. The agency said the new requirement may add about a minute to the estimated one hour it takes to prepare a prior notice document.