With the **Comments** link, you can add comments to&mdash;even host a discussion around&mdash;any item in the catalog that you have access to. Comment functionality is available in the **AI Catalog** (illustrated below), and also as a model tab from the Leaderboard and in use case tracking. With comments you can:

* Tag other users in a comment; DataRobot will then send them an email notification.
* Edit or delete any comment you have added (you cannot edit or delete other users' comments).

![](images/catalog-26.png)
