You can add comments to APIs in your subscription when creating or editing the applications.
Optionally, you can also add a comment from the Quick Actions menu.
Select or hover over an API, and from the Quick Actions menu, click Add Comment. The comments added when updating the application let you track the changes you made to the applications.
To view the comments added to API, click View from the Quick Actions menu.
On the Application Details page, go to the Action Log tab, and scroll down to the Comments section. This section is visible only if you added comments to the application.