In the News & Views article 'Astronomy: Andromeda's extended disk of dwarfs' by R. Brent Tully (Nature 493, 31–32; 2013), 13 dwarf companion galaxies of the Andromeda galaxy are described as lying “at distances from Messier 31 of between 35 and 400 kiloparsecs (114–1,305 light years)”. The distance values in units of light years should have been 114,000 to 1.3 million.