Tip: Don’t Double-Up On Your PDF Comments, Double-Click Instead!
Donna Baker posted an important tip to her AcroFacts blog about adding comments to PDF files:
Do you add comments like highlights or ovals, and then add a sticky note comment to explain the first comment? You don’t have to double up the comments like that. Instead, double-click the comment on the page to open a popup note, and type your message. Your users see a miniature comment talk balloon over the comment, indicating there’s an attached message.
It’s a matter of personal preference, but if you want to get your message across in the comments you add to a PDF file, say as part of a Shared Review, this is the better way to do it. Otherwise, it can be hard for the person collecting comments and the other reviewers to see how the highlight or drawing markup you added is associated with the separate sticky note you then put somewhere near it.