What belongs in a web design change order?

For an extra page or feature, I write down five things before the work starts: the original scope, the exact added deliverable, the added fee, any deadline shift, and the approval needed to begin. That gives both sides something concrete to review. ScopeSnap turns those details into a PDF and an approval email draft; the designer still reviews and sends it. Which part of a scope change tends to get missed in your projects?