Update README.md

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Josh <josh.t.richards@gmail.com>

README.md

@@ -101,7 +101,7 @@ If mounting additional volumes under `/var/www/html`, you should consider:
 - Mounting storage volumes to locations outside of `/var/www/html`.
 
 > [!WARNING]
-> You should note that data inside the main folder (`/var/www/html`) will be removed during installation and upgrades, unless listed in [upgrade.exclude](https://github.com/nextcloud/docker/blob/master/upgrade.exclude). The additional volumes officially supported are already in that list, but custom volumes will need to be added by you. We suggest mounting custom storage volumes outside of `/var/www/html` so that making this adjustment is unnecessary. If you must do so, however, you may build a custom image with a modified `/upgrade.exclude` file that incorporates your custom volume(s).
+> You should note that data inside the main folder (`/var/www/html`) will be overridden/removed during installation and upgrades, unless listed in [upgrade.exclude](https://github.com/nextcloud/docker/blob/master/upgrade.exclude). The additional volumes officially supported are already in that list, but custom volumes will need to be added by you. We suggest mounting custom storage volumes outside of `/var/www/html` and if possible read-only so that making this adjustment is unnecessary. If you must do so, however, you may build a custom image with a modified `/upgrade.exclude` file that incorporates your custom volume(s).
 
 
 ## Using the Nextcloud command-line interface