It would be great to have multiple colors or options so you can highlight different topics and organize your note making.
Carl Alexander commented
I am a technical writer. My document updates are derived from multiple sources and projects. If Acrobat could tag and categorize comments (like Outlook), creators and reviewers could sort and/or filter for the topic of interest.
Kelly Vaughn commented
This feature already exists. You can choose whatever colors you want. Use either the color picker or the Properties Toolbar.