  Recently, Aji and Goldenfeldt [Phys. Rev. Lett. 87, 197003 (2001),
cond-mat/0105622] put forward an explanation for the value of the dynamic
critical exponent z observed in certain Monte Carlo simulations of the
superconducting phase transition in zero magnetic field. In this Comment, we
point out that their analysis is based on incorrect assumptions regarding the
scaling dimension of the vortex density.
