  We present the first example of a Kahler potential for heterotic M-theory
which includes gauge bundle moduli. These moduli describe the background gauge
field configurations living on the orbifold fixed planes. We concentrate on the
bundle moduli describing the size and SU(2) orientation of a gauge five brane -
a soliton which is primarily composed of these gauge fields. Our results are
valid when the width of this object is small compared to the overall size of
the Calabi-Yau threefold. We find that, in general, it is not consistent to
truncate away these moduli in a simple manner.
