  A recent letter titled "Explicit Analytical Solution for Random Close Packing
in d=2 and d=3" published in Physical Review Letters proposes a first-principle
computation of the random close packing (RCP) density in spatial dimensions d=2
and d=3. This problem has a long history of such proposals, but none capture
the full picture. This paper, in particular, once generalized to all d fails to
describe the known behavior of jammed systems in d>4, thus suggesting that the
low-dimensional agreement is largely fortuitous.
