  We give historical remarks related to arXiv:2112.14547 ("A New Method of
Construction of Permutation Trinomials with Coefficients 1", by Guo et al.). In
particular, we show that the "new" permutation polynomials in that paper are
actually well known. In addition we give a simpler derivation of these
permutation polynomials than had been given previously, which demonstrates the
general method of producing permutation polynomials that was introduced in
arXiv:1310.0776.
