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Recently, El-Maaref {\it et al}\, [J. Phys. B 52(2019) 065202] have reportedresults for energy levels, radiative rates and collision strengths ($\Omega$)for some transitions of Kr-like W~XXXIX. For the calculations of theseparameters they have adopted several codes, including GRASP, DARC and FAC. Forenergy levels they have shown discrepancies of up to 1.64~Ryd between the GRASPand FAC calculations, whereas for $\Omega$ the differences between the DARC andFAC results are over an order of magnitude for a few transitions. In addition,for several transitions there is an anomaly in the behaviour of $\Omega$between the two sets of calculations. In this comment, we demonstrate thattheir results from both codes are incorrect, and hence cannot be relied upon.

Comment on "Atomic structure and excitation cross section by electron  impact of tungsten ions, W$^{38+}$" by El-Maaref et al [J. Phys. B 52(2019)  065202]