The authors regret that the printed version of the above article contained an error that misrepresented the work of Mangold and Grubbs [Chem. Sci., 2015, 6, 4561–4569]. Their work presented an expedient Z-selective ethenolysis strategy to enrich E-configured peptides, rather than Z-configured peptides as stated in the Digest. Corrections to Tables 3 and 4 are shown below. The authors would like to sincerely apologise for any inconvenience caused.