In project pages there are two options that look pretty similar: "Watch Project" and "Subscribe".
Clicking "Watch Project" you get a dialog:
Watching a project will let you monitor it closely. You will receive email and notifications about changes to every object associated with projects you watch.
Clicking "Subscribe" directly subscribes you, but most users will not know what are they subscribing to, and what is the difference compared to watching a project. Should "Subscribe" also have a dialog with the explanation?