Each article with then support portal can be followed, so in the instance that the article is ever updated in any way a notification will be generated and sent to you.
Once within the article you wish to follow, the 'Follow' button can be found on the right hand side:
Once selected the text in the box will change:
Each time this article is then changed in any way an email notification will be sent to you advising of this.
To unfollow an article, click the 'Unfollow' button. The text will then revert back: