You can now add a comment on any component (flow, buffer, connection, relay, parameter, API & operations view) to provide more details, including adding images/ diagrams and hyperlinks.
The Comments page can be found by selecting a component and clicking on Comments which is circled in red and located at the bottom left of the webpage as shown in the image below.
You can add as many comments as desired which also can be formatted and searched for. The highlighted icons illustrated in the below image is how you can save, edit or delete a comment. You can also search for a specific comment.