Panel 1: Upon arriving home, John is taken aback when Liz says "Guess what, Daddy!! Mom has laryngitis!!"
This is not just because Elly has laryngitis. He is also non-plused by how happy that makes Elizabeth.
Panel 2: He's equally confused by Mike's upbeat tone when the boy talks about how Elly is forced to be silent and comments on how frustrating that must be for her.
Panel 3: When he sees the endless passive-aggressive notes taped to any flat surface that treat the children like imbeciles she has to stand over to make sure things get done, Mike tells John that Elly has had to resort to a nag-by-note syndrome.
Summary: This leads us directly to tomorrow's rank-out at Elly's expense in which John angers her by reminding her that they find it a relief not to have an angry voice yell "NO!!!" all the time.