One Sentence Per Page
One purpose of annotation is to make a more useful version of your thesis for the viva. Another purpose is to engage again with your thesis and think more about what’s in there and what it means.
One helpful annotation you could make is to add one sentence to the top of each page: read, think and then add one sentence to the top of each page that summarises what’s below. One sentence, maybe ten words or less to briefly describe what else is on the page.
This fulfils the point of engaging with your thesis and thinking carefully about it – and creates a more useful version of your thesis for the viva, complete with a commentary track about everything you’ve presented.