  We discuss string corrections to the effective potential in various models of
brane inflation. These corrections contribute to the mass of the inflaton
candidate and may improve its slow-roll properties. In particular, in
orientifold string compactifications with dynamical D3- and D7-branes, the
corrections induce inflaton dependence in the part of the superpotential that
arises from gaugino condensation or other nonperturbative effects. The
additional terms are in part required by supersymmetry. We explicitly discuss
D3/D7-inflation, where flat directions of the potential can be lifted, and the
KKLMMT model of warped brane inflation, in which the corrections open up the
possibility of flattening the potential and canceling unwanted contributions to
the inflaton mass.
