The purpose of this note is to correct some statements and numerical examples' results in the above paper. A few remarks are also given to clarify the facts that for systems with small delay, the results in Han et al. (2003) are much less conservative than those in Kwon and Park (2004); for systems with nonsmall delay, the criterion in Kwon and Park (2004) fails to make any conclusion, while the criterion in Han et al (2003) can be applicable to these kinds of systems.