It has been noticed that the lightness dependency of equal chroma loci of the nonlinear color-appearance model already reported deviates markedly from that of equal Chroma loci of the Munsell scheme. To solve this problem, the new chroma C-N of the model is proposed by applying the correction of lightness L(A) to the chroma C previously used. The chroma C is now used to predict the saturation of the newly revised model. The introduction of C-N improves significantly the agreement of lightness dependency between the model chroma, the Munsell Chroma, and the NCS chromaticness at various lightness levels. The formulation for the revised nonlinear color-appearance model is given in the Appendix.