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We offer a clarification of the significance of the indicated paper of H.Cheng. Cheng's conclusions about the attractive nature of Casimir forcesbetween parallel plates are valid beyond the particular model in which hederived them; they are likely to be relevant to other recent literature on theeffects of hidden dimensions on Casimir forces.

Comment on: "The Casimir force on a piston in the spacetime with extra compactified dimensions" [Phys. Lett. B 668 (2008) 72]