Pfizer and BioNTech, the companies that produced the first coronavirus vaccine to get emergency use authorization by the Food and Drug Administration, will supply the United States with an additional 100 million doses of their COVID-19 vaccine.

The companies announced the deal Wednesday and said they expect to deliver all the doses by July 31. Pfizer already agreed to supply the U.S. government with 100 million doses of its vaccine, meaning it will produce 200 million shots. The new total will be enough to vaccinate 100 million people since each vaccine requires two doses.