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Recently Schautz and Flad concluded that the Hellmann-Feynman theorem holdswithin the fixed-node diffusion quantum Monte Carlo (DMC) method. We show thatthe Hellmann-Feynman expression is not in general equal to the derivative ofthe DMC energy with respect to some parameter $\lambda$ if the nodal surfacedepends on $\lambda$.Comment: 2 pages. To appear in J. Chem. Phy

Comment on “Quantum Monte Carlo study of the dipole moment of CO” [J. Chem. Phys. 110, 11700 (1999)]