In the News & Views article 'Biological physics: Filaments band together' by Jean-François Joanny and Sriram Ramaswamy (Nature 467, 33–34; 2010), reference 12 (Chaté, H. et al. Phys. Rev. E 77, 046113; 2008), not reference 11, should have been cited as the source of the image in Figure 1a.