A Note on “Two new approaches for a two-stage hybrid flowshop problem with a single batch processing machine under waiting time constraint”

•The errors about limited waiting time in the original paper are analyzed.•A correct mixed-integer linear programming model is proposed to describe the problem.•The confusing blocking time is discussed.•Numerical experiments are conducted to illustrate the necessity of correction.

The two-stage flow shop scheduling problem with a batch processing machine and limited waiting time was studied in the paper entitled “Two new approaches for a two-stage hybrid flowshop problem with a single batch processing machine under waiting time constraint” [Chung, T.-P., Sun, H., Liao, C.-J., 2016, Computers & Industrial Engineering, 10.1016/j.cie.2016.11.031]. In the original paper, this problem was formulated as a mixed-integer linear programming model. However, this model is not correct and the blocking time is confusing. In this note, a correct mixed-integer linear programming model is proposed and the confusing blocking time is discussed. Numerical experiments are conducted to illustrate the necessity of correction.