  Within the Dyson-Schwinger equation formulation of QCD, a rainbow ladder
truncation is used to calculate the pion valence-quark distribution
function(PDF). The gap equation is renormalized at a typical hadronic scale, of
order 0.5GeV, which is also set as the default initial scale for the pion PDF.
We implement a corrected leading-order expression for the PDF which ensures
that the valence-quarks carry all of the pion's light-front momentum at the
initial scale. The scaling behavior of the pion PDF at a typical partonic scale
of order 5.2GeV is found to be $(1-x)^{\nu}$, with $\nu\simeq 1.6$, as $x$
approaches one.
