Zoom-in of the Hα emission line of SN 2021ukt at two epochs: the earliest one for which we have a spectrum (−12.2 days before V-band maximum) and one of the latest. The results of the MCMC fitting performed on continuum-subtracted spectra are shown, with v_C referring to the central velocity of the broad Gaussian in the second spectrum. These careful fits to the Hα emission lines are important for the classification of SN 2021ukt as a SN Ib with IIn features – and at the earliest time, as a bona fide SN IIn.