Abstract
In a recent paper, Zhang and Li [J. Math. Phys. 56, 084101 (2015)] have doubted our claim that whenever a nonlinear equation has solutions in terms of the Jacobi elliptic functions cn(x, m) and dn(x, m), then the same nonlinear equation will necessarily also have solutions in terms of dn(x,m)±mcn(x,m). We point out the flaw in their argument and show why our assertion is indeed valid.
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