In the article by Harrower et al. (2019), the following reference was omitted: Phillipson, D.W. 2009. Ancient churches of Ethiopia. New Haven (CT): Yale University Press. On page 1543 of the article, the Phillipson (2009) citation is for this omitted reference, as is the second Phillipson (2009) citation on page 1549, and not to Phillipson, L. 2009. Using stone tools: evidence from Aksum, Ethiopia. Oxford: Archaeopress.