Add a note about the tab only being visible to staff in the README

README.md

@@ -2,6 +2,10 @@
 
 A Discourse theme component that places a tab in the topics list called "Assigned" that shows the topics that are assigned to the current user.
 
+> **Note:** Since the way we've configured the [discourse-assign plugin][discourse-assign] is that it is visible to staff only, the added "Assigned" topic list tab is also only visible to staff.
+
+[discourse-assign]: https://meta.discourse.org/t/discourse-assign/58044
+
 ## License
 
 [MIT](LICENSE.md)