Ben-Naim’s article treats some complex changes not dealt with in general chemistry texts and thus may be most useful in physical chemistry and statistical mechanics. However, it is vital to point out that his well-presented content is unduly limited in that it is based solely on Shanon’s measurement of information in the expansion of gases. Thus, readers are unaware that an energy-based thermodynamics view of entropy-now presented in so many chemistry texts-deals with such expansions as simple the spreading of molecular energy of each gas species into larger volumes.