Walmart announced on Tuesday that it was teaming with DoorDash to help expand the retailer's online grocery delivery option. The deal with kick off in the Atlanta metro area before expanding to an expected 40 percent of United States households by the end of the year.

“We’re connecting all the parts of our business to create a shopping experience like no one else can. With the expansion of our Online Grocery Delivery program, customers can have great items at every day low prices delivered to their door with the click of a button,” says Greg Foran, president and CEO, Walmart. “With the help of DoorDash, we’re delivering the best of Walmart to customers in Atlanta and beyond.”

Until now, DoorDash only delivered prepared restaurant meals. Walmart's personal shoppers — more than 18,000 of them — must complete a three-week training program learning how to select products and cuts of meat for online grocery customers. Those shoppers will team with DoorDash's delivery modes to help send groceries to customers.

"Our work with Walmart marks DoorDash's official launch beyond restaurant delivery," says DoorDash CEO Christopher Payne. "We look forward to expanding across the country, enabling Walmart customers everywhere to spend more time doing the things they love."