  We revisit the possibility of first order electroweak phase transition~(EWPT)
in one of the simplest extensions of the Standard Model (SM) scalar sector,
namely the two-Higgs-doublet model~(2HDM). We take into account the ensuing
constraints from the electroweak precision tests, Higgs signal strengths, and
the recent LHC bounds from direct scalar searches. By studying the vacuum
transition in 2HDM, we discuss in detail the entropy released in the first
order EWPT in various parameter planes of 2HDM.
