  At the next generation of linear colliders, forward-backward asymmetries will
be involved again in the precise determination of the neutral current couplings
of heavy quarks in inclusive heavy-quark production. The theoretical
understanding of these observables at the level of NNLO radiative corrections
is required. We review a recent calculation of the two-parton contribution to
the heavy-quark A_FB at NNLO QCD in e+e- collisions. The results are valid for
arbitrary values of the momentum transfer and non-vanishing heavy-quark mass
m_Q.
