In the News & Views article “Linguistics: An invisible hand” by W. Tecumseh Fitch (Nature 449, 665–667; 2007), artist's errors occurred in Figure 1, the glossogenetic tree of Indo-European language redrawn from a historical source. “Islamic” should read “Slavic”. “Ukranian” should read “Ukrainian”. And the branch leading to the Greek group of languages should likewise be labelled “Greek”.