Nature Reviews Drug Discovery 12, 433–446 (2013)

The second paragraph in the section titled “Challenges in targeting long non-coding RNAs” on page 442 of this Review was inserted during manuscript revision. The wording of this paragraph drew heavily on, and mostly repeated, a paragraph in an earlier review article by J. T. Lee (Lee, J. T. Epigenetic regulation by long noncoding RNAs. Science 338, 1435–1439; 2012). Although the Science review was cited elsewhere in this article, it should also have been cited at this point in order to attribute correctly the ideas expressed by Lee. The author apologizes for introducing this passage, and for the lack of citation to the paper from which it derived, and is pleased to correct the record accordingly.