Comment on "Cumulant mapping as the basis of multi-dimensional spectrometry" by Leszek J. Frasinski, Phys. Chem. Chem. Phys. , 2022, 24 , 20776-20787.

I state a general formula for the n -variate joint cumulant of the first order and prove that it satisfies the desired properties listed in Section 3.3 of Phys. Chem. Chem. Phys. , 2022, 24 , 20776-20787.