Combined Nearly Ideal Binary Solvent/Redlich-Kister (CNIBS/R-K) equations reported by our group (J. Chem. Thermodyn. 106 (2017) 123-131) for calculating the solubility of phthalimide in mixed solvents of (acetone, ethyl acetate or acetonitrile + methanol) at various temperatures. The numerical values of the curve-fit equation coefficients do not provide a satisfactory representation of the mole fraction solubility of phthalimide in (acetonitrile + methanol) binary mixtures. The values of the correlation parameters for the CNIBS/R-K model were recalculated.