  This note is an addendum to our earlier work \cite{humi}. In \cite{humi}, we
studied a Hamiltonian action for a generalized Calabi-Yau manifold and showed
that the Duistermaat-Heckman theorem holds. The purpose of this note is to show
that the density function of the Duistermaa-Heckman measure is a piecewise
polynomial. We also prove that the localization formula holds.
