Thanks - I don't have the section as an editable zone and hadn't planned to make it as one.
Is that mandatory to have it included in a text version?
It is happening in both the preview text and the send a test.
I will make it an editable zone and handle it that way as needed, but was hoping there was a way within the source code to push it out.
Alternatively, you can create a snippet that contains your unsubscribe info/link (which includes both html and text). This will also enable you to change just the snippet in the future and have it reflected across all templates and emails.