Nature Reviews Molecular Cell Biology 18, 331–337 (2017) https://doi.org/10.1038/nrm.2017.12 Published online 08 March 2017

The original Acknowledgements section is missing funding information. The full Acknowledgements should read:

‘The authors are grateful to J. Rinn for his comments on the manuscript. L.S., M.B.-N. and R.G.J. are funded by a European Research Council (ERC) Starting Grant (ChromatinRNA, 311704).’