One H atom basically binds onto this nitrogen, and the other H atom binds onto this nitrogen. And we form the reduced form of flavin mononucleotide known as FMN H two. And that's why we need an additional H ion. So one H ion comes from here, the other H ion comes from here. And the two electrons are found on the NADH. And we ultimately oxidize the NADH into NAD plus and we form the SMN H two.