Unlike the situation for ionic aqueous solutions, the relationship between the density maximum temperature T-md and solute concentration for aqueous solutions of primary alcohols is known to be strongly non-linear. Using our recent theory for the existence of the maximum density in water in terms of quantum zero point energy effects, we explain why this is so. We also explain why some of the alcohols show a maximum in their Tmd vs. concentration curves but others do not. (C) 2008 Elsevier B.V. All rights reserved.