Users can sign up to receive an email notification when there is any change or a comment to any page (=node). You have to be signed in to sign up.
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![](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/1069/Screen%2BShot%2B2016-08-06%2Bat%2B1.10.08%2BPM.png)
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You can also subscribe to a page  **subgraph** -- page and all of its descendant pages. This is a good way to stay updated on the developments withing a topic of the page and all of its subtopics represented by the descendant pages.
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![](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/1070/Screen%2BShot%2B2016-08-06%2Bat%2B1.10.08%2BPM%2B2.png)
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If you are subscribed to a page as a part of subgraph, at the top of the page you will see through which node you are subscribed.
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![](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/1068/Screen%2BShot%2B2016-08-06%2Bat%2B1.11.14%2BPM.png)
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