In order to add an addendum to the closed document, you will need to:
Scroll to the bottom of the form and click +Add Addendum

A modal will pop up, this is where you will select the type of addendum from the drop-down and enter your content.

Your success message will appear and that's it! You're done. 

Note: addendum's are only available to be edited within the first hour of adding them. After that they are permanent. 

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