  We present an analytic, recoil-order calculation of the proton asymmetry from
polarized neutron $\beta$-decay. The differential decay rate in terms of
electron energy and proton direction follows, parametrized in terms of the most
general Lorentz-invariant hadron current coupled to a left-handed lepton
current. Implications for experimental efforts to measure recoil-order currents
are discussed.
