Comments on the recent studies of electrorheological (ER) properties of hydrosoluble beta-cyclodextrin polymer based ER fluids are given based on the analysis of their yield stress data as a function of applied electric field strengths. Using our previously reported universal yield stress equation and critical electric field strengths deduced, it is found that we can collapse their data into a single curve. (c) 2006 Elsevier Ltd. All rights reserved.