The conventional explanation of aerodynamic lift based on Bernoulli's equation is one of the most common mistakes in presentations to school students and is found in children's science books. The fallacies in this explanation together with an alternative explanation for aerofoil lift have already been presented in an excellent article by Babinsky (2003 "Phys. Educ." 38 497-503). However, in Babinsky's explanation, the air friction forces are ignored and the flow-field curvature introduced by the aerofoil shape is understood intuitively. In this article, a simple analysis of the lift with friction forces incorporated is presented to give a more precise qualitative explanation. (Contains 4 figures.)