A method of masking tonal noise from a wind turbine, the method comprising: obtaining one or more noise characteristics; determining one or more masking performance variables for multiple reference spectra on the basis of the one or more noise 5 characteristics, wherein the reference spectra have different spectral shapes; selecting one or more of the reference spectra on the basis of their one or more masking performance variables; and generating masking noise which masks the tonal noise, wherein a spectral shape of the masking noise is generated on the basis of the selected one or more reference spectra. The invention enables an improved masking 10 performance by tailoring the spectral shape of the masking noise on the basis of one or more masking performance variables.
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