The News & Views article “Chemical physics: Electronic movies” by Marc Vrakking (Nature 460, 960–961, 2009) stated at the end of the fifth paragraph that “A similar conclusion was recently reached in a study of harmonic generation from nitrogen molecules”, and incorrectly cited reference 8 of the article. This should have cited B. K. McFarland et al. Science 322, 1232–1235 (2008).