Measured ${\rm f}_1(1285)$ mass as a function of $p_{\rm T}$ at midrapidity ($|y| < $ 0.5) in minimum-bias pp collisions at $\sqrt{s} =$ 13 TeV. The statistical and systematic uncertainties are shown as bars and boxes, respectively. The blue band represents the world-average value for the mass of ${\rm f}_1(1285)$ having an uncertainty of 0.5 MeV/$c^{2}$.