Notes are a great way to keep on top of your links and stay organized. You can leave guidance for the rest of your team, jot down something you don't want to forget, or just leave yourself a sweet little note for the next time you view a link.
The notes section is for your own benefit. Notes will never be viewable to your end users and they're not required to create geni.us links.
You can add a note whenever you create or edit a link. To do so, just click the speech bubble icon under the link's vanity code.