We examine the scaling properties of correlations in the extended capillary‐wave model [Physica A184, 367 (1992)]. The procedure developed previously by Weeks and collaborators to study interfacial correlations applies to the extended case and reproduces most of the earlier features. The extended model is consistent with the expression for the bending rigidity given by the fourth moment of the direct correlation function. The scaling properties differ from those of the ordinary model whend=3, for which we find that the correlations obey scaling on length scales less thanLc.