Use comments to get feedback from the users who actually consume your APIs. On each API you can work with comments. The comments are shown directly on the API documentation page.
By default comments are enabled. If you want to turn off the comments go to your API and click on Settings in the left sidebar. Uncheck the Enable comments checkbox and you are done. For public APIs it is also possible just to disable the community comments. This feature is especially useful for organizations in case they want to comment just with their team.
By default you are automatically subscribed to your own APIs. As soon as someone adds or updates a comment you will get a notification. The notifications are shown on your dashboard. Here an example: