Nat. Struct. Mol. Biol. 22, 867–874 (2015); published online 4 November 2015; corrected after print 20 April 2017

The schematic of the TERT subunit in Figure 1 incorrectly identified the 'Internal RNA template': it now correctly indicates the telomerase RNA. The RNA template sequence has been corrected from AAUCCCAAU to AAUCCCAAUC, and the DNA sequence of the repeat synthesis product added to the 3′ overhang was changed from GGGTTA to GGTTAG. These errors have been corrected in the HTML and PDF versions of the article.