This comment considers the high-energy behavior of a particle of arbitrary spin interacting with an external potential $A_{{\mu }_1\cdots {\mu }_n}\mathrm{}\left(x\right)\mathrm{}$ by means of a $J^{{\mu }_1\cdots {\mu }_n}{A}_{{\mu }_1\cdots {\mu }_n}\mathrm{}\left(x\right)\mathrm{}$ interaction, where $J^{{\mu }_1\cdots {\mu }_n}$ is a function of the fields and their derivatives. It is shown that in the eikonal approximation, "exponentiation" occurs when the light-cone commutation relations satisfy $\int {-\infty }^{\infty }{\mathrm{dx}}^{-}\int {-\infty }^{\infty }{\mathrm{dy}}^{-}{\left[J^{+\cdots +}\mathrm{}\right(x),J^{+\cdots +}\mathrm{}(y\left)\right]}_{x^{+}=y^{+}=0\mathrm{}}=0.\mathrm{}$

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