The News & Views article 'Quantum physics: Two-atom bunching' by Lindsay J. LeBlanc (Nature 520, 36–37; 2015) described a paper reporting a type of two-particle quantum interference called the Hong-Ou-Mandel effect using helium-4 atoms, but did not make clear that similar two-particle quantum interference had previously been reported using rubidium-87 atoms (A. M. Kaufman et al. Science 345, 306–309; 2014).