  We point out an inconsistency in perturbative QCD predictions previously used
for dijet azimuthal decorrelations for azimuthal angles of $\Delta\phi_{\rm
dijet} < 2\pi/3$ between the two jets. We show how the inconsistency arises and
how the calculations can be modified to provide more accurate results that
exhibit a smaller scale dependence and give a better description of the data
than the inconsistent results. We also explain how the quality of the
predictions strongly depends on a perceivedly minor detail in the definition of
the dijet phase space and give recommendations for future measurements.
