  We discuss the validity of the Standard Model Effective Field Theory (SM EFT)
as the low-energy effective theory for the two-Higgs-doublet Model (2HDM).
Using the up-to-date Higgs signal strength measurements at the LHC, one can
obtain a likelihood function for the Wilson coefficients of dimension-6
operators in the EFT Lagrangian. Given the matching between the 2HDM and the
EFT, the constraints on the Wilson coefficients can be translated into
constraints on the parameters of the 2HDM Lagrangian. We discuss under which
conditions such a procedure correctly reproduces the true limits on the 2HDM.
Finally, we employ the SM EFT to identify the pattern of the Higgs boson
couplings that are needed to improve the fit to the current Higgs data. To this
end, one needs, simultaneously, to increase the top Yukawa coupling, decrease
the bottom Yukawa coupling, and induce a new contact interaction of the Higgs
boson with gluons. We comment on how these modifications can be realized in the
2HDM extended by new colored particles.
