What's the difference between addendum and supplement? The way I see it they both mean pretty much the same thing. It's something added to something else to complete it. I think supplement can be used in a wider, more general sense, while addendum is used in published works like books, more or less. In a way, it seems to me that they overlap each other. But does that mean that they are synonymous?
An addendum is added to the end of a document to:
- make corrections that could not be made "in-line"
- last minute changes
The material in an addendum usually threads back directly to specific parts of the main text.
A supplement is added to the end of a document to:
- give background material
- supply additional related material
The material in a supplement is a little more "stand-alone" and enhances the reader's understanding. They are related, but I don't think they are synonymous.