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The analysis of tagged ${B}_{s}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\phi}$ decays determines the $CP$ phase ${\ensuremath{\phi}}_{s}$ in ${B}_{s}\ensuremath{-}{\overline{B}}_{s}$ mixing with a twofold ambiguity. The solutions differ in the sign of $\mathrm{cos}{\ensuremath{\phi}}_{s}$ which equals the sign of the width difference $\ensuremath{\Delta}{\ensuremath{\Gamma}}_{s}$ among the two ${B}_{s}$ mass eigenstates. We point out that this ambiguity can be removed …