  In [5], without giving a detailed proof, Yamauchi provided a formula to
calculate the genus of a certain family of smooth complete intersection
algebraic curves. That formula is used extensively in [1] to study the
algebraic curves for which their Jacobian has superelliptic components. In this
note, we determine the correct version of the genus formula with an algebraic
proof. Then, we show that the formula given in [5] works only under certain
conditions.
