How did IGListKit update sectionHeader?

Question

When I use ListBindingSectionController<ListDiffable> for sections, I can not find out any way to update header.I have try Calendar Demo without any clues.Or ListBindingSectionController is just Not Support Updating Header or Footer?.
Cells in IGListKit is ListBindable, cells update in func bindViewModel. Headers or footers is just a view,there is no way to update.