The expressions for the induced norms of two complex matrix operators, give
n in [J.-G. Sun, SIAM J. Matrix Anal. Appl., 19 (1998), pp. 39-65], must be
corrected. In this note we give the true values of these induced norms, wh
ich are involved in the perturbation analysis of matrix algebraic Riccati e
quations in the complex domain.