Update INSTALL.md

INSTALL.md

@@ -129,6 +129,8 @@ Stud.IP root users currently get `ROLE_ADMIN` and are therefore factual Opencast
 
 The plugin has been renamed to `OpencastV3`. When updating from V2 or and older V3, the plugin takes steps to rename things to make it work for the new plugin versions. After these steps, the old version of the plugin will remain in your Stud.IP installation in a deactivated state with a DB version of `0` and can be safely deinstalled in that case. Make sure the plugin is really showing a `0` before uninstalling it, otherwise bad things WILL happen!
 
+Another thing to note is, that the URL in the user provider is changed! See the section about the user provider for correct configuration! 
+
 If you are migrating from version 2.x of this plugin, you can use `tools/pre_migrate_acls.php` in the weeks before installing the new version to shift workload on opencast before the installation. The Cronjobs should take care of anything missing nonetheless, so this step is useful but not absolutely necessary. Just keep in mind, that ALL videos in your Opencast system will have to run through a `republish-metadata`-workflow in order for all plugin functions to work correctly!