Corrigendum to “Preconditioners for regularized saddle point problems with an application for heterogeneous Darcy flow problems” [J. Comput. Appl. Math. 280 (2015) 141–157]

After a recent publication of our paper (Axelsson et al., 2015), we found two incorrect/incomplete statements in Section 2 of the paper. These statements do not have an influence on the rest, i.e. the major part of the paper, but we feel that it is proper to publish a corrigendum. The considered statements concern first the conditions of nonsingularity of a nonsymmetric saddle point system, second the number of unit eigenvalues of a preconditioned system. The correct statements are presented in this short communication.