This data repository contains experimental Raman spectra of the sp3 defect site formation stages in K-doped graphene exposed to H2O, O2 and H2. The data are presented in Figs.1 and 2 of the authors correction to the reference "Precise determination of graphene functionalization by in situ Raman spectroscopy" [P. Vecera, J. C. Chacón-Torres, Nature Communication 8, 15192 (2017)].