The authors of “Surnames and Social Mobility, 1170–2012,” Human Nature, 25(4):517–537 (2014) wish to make the following clarification. The value for the heritability of height reported in fn. 1 (p.518), 0.64, refers to the value reported in table 1 of James A. Hanley’s (2004) “Transmuting women into men: Galton’s family data on human stature,” The American Statistician, 58(3):237–243. That paper is a reanalysis of Francis Galton’s (1886) “Regression towards mediocrity in hereditary stature,” Journal of the Anthropological Institute of Great Britain and Ireland, 15, 246–263. The citation we used in our Human Nature paper (Silventoinen et al. 2003) is incorrect as it refers to a wide range of studies with different methods and is not necessarily directly comparable with the Clark-Cummins study. We thank an anonymous referee for pointing this out.