How can I know when a Reviewer is done reviewing my manual?

Reviews can now send notifications when they are done reviewing the document. The notification is sent to the Document Owner.

Step 1:

First, the Admin needs to activate the email notification:

1. Go to System → Settings.
2. Under the General section, click on Email Templates.
3. Click on Review Done.
4. Set Active to Yes.
5. Click Save."

Step 2:

In your manual, make sure that the manual has a document owner: 

Settings → General Settings → Select a Document Owner from the drop-down menu.

Step 3:

Then, under review, click on "Enable and notify Reviewers" → Enable review → Tick in the box next to "Inform Document Owner that Reviewer is done"

Step 4:

The reviewer can now click on the "I'm Done!" button as soon as they are done reviewing. The "I'm Done!" button can be found under Review.