  One of the assumptions leading to the Gross-Pitaevskii Equation (GPE) is that
the interaction between atom pairs can be written effectively as a \delta
-function so that the interaction range of the particles is assumed to vanish.
A simple model that takes into account the extension of the inter-particle
potential is introduced. The correction to the GPE predictions for the energy
of a condensate confined by a harmonic trap in the Thomas-Fermi (TF) regime is
estimated. Although it is found to be small, we believe that in some situations
it can be measured using its dependance on the frequency of the confining trap.
Due to the simplicity of the model, it may have a wide range of applications.
