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If the Higgs boson is a pseudo Nambu–Goldstone boson (PNGB), the hZγ contact interaction induced by the O(p4) invariants of the non-linear sigma model is free from its nonlinearity effects. The process h→Zγ can be used to eliminate the universal effects of heavy particles, which can fake the nonlinearity effects of the PNGB Higgs boson in the process h→V⁎V (V=W±, Z). We demonstrate that the ratio of the signal strength of h→Zγ and h→V⁎V is good to distinguish the signature of the PNGB Higgs boson from Higgs coupling deviations.