  We revisit the two-stage procedure for moduli stabilization in Type IIB
orientifolds at light K\"ahler-modulus limit. In view of the necessity to keep
the K\"ahler geometry structure of the moduli space during the stabilization,
we define a holomorphic quantity called effective superpotential. The KKLT
superpotential as well as the superpotential proposed by Villadoro and Zwirner
are then examined with respect to this holomorphic effective superpotential.
The mechanism is also illustrated with a simple toy model of one complex
structure modulus.
