Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-020-0468-7, published online 9 July 2020.

In the version of this article initially published, in the Data availability statement, the PDB code for the SARS-CoV-2 S cleaved, closed structure was incorrect. The correct PDB code is 6ZGI. The error has been corrected in the HTML and PDF versions of the article.