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In a recent Letter [J. K. Dong et al., Phys. Rev. Lett. 104, 087005 (2010)],Dong \textit{et al}. have observed a $T^{1.5}$ dependence of resistivity $\rho$in KFe$_2$As$_2$ at the upper critical field $B_{c2}$ = 5 T parallel to the caxis and have suggested the existence of a field-induced quantum critical point(QCP) at $B_{c2}$. In this comment, we argue that observation of a $T^{1.5}$dependence of $\rho$ in a sample showing broad resistive transitions does notconstitute evidence for a QCP and that recent dHvA results do not support theproposed QCP.

Comment on "Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe$_2$As$_2$"