Update CHANGELOG.md (#3181)

* Update CHANGELOG.md

* Update CHANGELOG.md

CHANGELOG.md

@@ -207,7 +207,7 @@ As mentioned above, static files like `/.well-known/matrix/*` or your base domai
 
 All of this has been extracted into a new `matrix-static-files` Ansible role that's part of the playbook. The static files generated by this new role still live at roughly the same place (`/matrix/static-files/public` directory, instead of `/matrix/static-files`).
 
-The playbook will migrate and update the files automatically. It will also warn you about usage of old variable names, so you can adapt to the new names.
+The playbook will migrate and update the `/.well-known/matrix/*` files automatically but not your own files in `nginx-proxy/data/matrix-domain/` you will need to back these up yourself otherwise they will be lost. It will also warn you about usage of old variable names, so you can adapt to the new names.
 
 
 ### A note on performance