Comment on "Resolving the sign ambiguity in $\mathrm{\Delta }{\mathrm{\Gamma }}_s$ with $B_s\to D_{s}K$"

This is a comment on the recent paper by Soumitra Nandi1 and Ulrich Nierste ``Resolving the sign ambiguity in $\mathrm{\Delta }{\mathrm{\Gamma }}_s$ with $B_s\to D_{s}K$’', arXiv:0801.0143 [hep-ph].