Errors are discovered regarding the published equation coefficients of Zhang and co-workers [J. Chem. Thermodynamics 89 (2015) 233-239] for mathematically describing the solubility behavior of 2-cyanoguanidine in neat solvents using the lambda h equation. The back-calculated values using the published equation coefficients are not the mole fraction solubility as stated in the published paper. Furthermore, the lambda and h parameters were re-analysed according to the experimental solubility data. (C) 2018 Elsevier Ltd.