  In our previous paper, we studied the category of semifinite bundles on a
proper variety defined over a field of characteristic 0. As a result, we
obtained the fact that for a smooth projective curve defined over an
algebraically closed field of characteristic 0 with genus $g>1$, Nori
fundamental group acts faithfully on the unipotent fundamental group of its
universal covering. However, it was not mentioned about any explicit module
structure. In this paper, we prove that the Chevalley-Weil formula gives a
description of it.
