Comment on "Temperature dependent correlation length for the S=1/2 Quantum Heisenberg Antiferromagnet on the square lattice"

We present high precision quantum Monte Carlo data for the two dimensional S=1/2 quantum Heisenberg antiferromagnet, up to $\xi = 70.9(2)$. Our data show clear disagreement with a recent theory proposed by Cuccoli et al (Phys. Rev. Lett. 77, 3439 (1996)).