In a recent paper [Lee, Y. S., Moon, Y. S., Kwon, W. H., & Park, P. G. (2004). Delay-dependent robust H-infinity control for uncertain systems with a state-delay. Automatica 40, 65-72], a robust control for time-delay systems has been proposed. Unfortunately, there exists a mistake which is fundamental to the results of the paper. (C) 2007 Elsevier Ltd. All rights reserved.