In the March 2012 issue of MRS Bulletin, the following reference was omitted from the Rondinelli et al. article: E. Bousquet, M. Dawber, N. Stucki, C. Lichtensteiger, P. Hermet, S. Gariglio, J.M. Triscone, P. Ghosez, Nature 452, 732 (2008). This should have been cited in place of Reference 47 on pages 263 (second citation), 268, and 269.