Nat. Chem. Biol. 7, 661–663 (2011); published online 19 September 2011; corrected after print 23 September 2011

In the version of this article initially published, on p.661, column 3, mustard oil was mistakenly grouped with cinnamaldehyde as an α,β-unsaturated carbonyl. The sentence should have read “...whereas α,β-unsaturated carbonyls such as cinnamaldehyde and the structurally unrelated mustard oil activate TRPA1 through the formation of Michael adducts....” The error has been corrected in the HTML and PDF versions of the article.