In the December 2017 issue, the article “Drugs that made headlines in 2017” (Nat. Med. 23, 1392–1393, 2017) inaccurately described the mechanism of the RNAi drug fitusiran. The drug does not fix defective RNA code or a defective protein, but rather suppresses the production of a functional protein. The error has been corrected in the HTML and PDF versions of the article as of 9 January 2018.