  In a recent note [High Energy Density Phys. 7, 161 (2011)], B.G. Wilson and
V. Sonnad proposed a very useful closed form expression for the efficient
generation of analytic log-linear radial meshes. The central point of the note
is an implicit equation for the parameter h, involving Lambert's function W[x].
The authors mention that they are unaware of any direct proof of this equation
(they obtained it by re-summing the Taylor expansion of h using high-order
coefficients obtained by analytic differentiation of the implicit definition
using symbolic manipulation). In the present comment, we present a direct proof
of that equation.
