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 Corrigendum to A dual iterative substructuring method with a small penalty parameter'', [J. Korean Math. Soc. 54 (2017), No. 2, 461--477] J. Korean Math. Soc.Published online April 2, 2021 Chang-Ock Lee, Eun-Hee Park, and Jongho Park KAIST, Kangwon National University Abstract : In this corrigendum, we offer a correction to [J. Korean. Math. Soc., 54 (2017), pp. 461--477]. We construct a counterexample for the strengthened Cauchy-Schwarz inequality used in the original paper. In addition, we provide a new proof for Lemma 5 of the original paper, an estimate for the extremal eigenvalues of the standard unpreconditioned FETI-DP dual operator. Keywords : domain decomposition, dual substructuring, FETI-DP MSC numbers : 65F10, 65N30, 65N55 Full-Text :