Correction to: Nature Reviews Disease Primers https://doi.org/10.1038/s41572-020-0189-6, published online 23 July 2020.

In this article ref. 61 was incorrect and should have been ‘Greaves, P. et al. Defining characteristics of classical Hodgkin lymphoma microenvironment T–helper cells. Blood 122 (16), 2856–2863 (2013)’. The original article has been corrected.