Correction to: Nature Chemistry https://doi.org/10.1038/s41557-018-0007-x, published online 19 March 2018.

In the version of this Article originally published, in Fig.1f there was an erroneous ‘Gly–Gly’ label placed above the foldamer–peptide structure. Furthermore, in Fig. 2a, the expected target structures from substrates 9 and 10 were inadvertently swapped. These errors have been corrected in the online versions.