diff --git a/src/views/app.html b/src/views/app.html
index 059ae099b..59cfbbd44 100644
--- a/src/views/app.html
+++ b/src/views/app.html
@@ -731,7 +731,7 @@
             <label class="control-label" for="resourcesEnableDataDir">Storage <sup><a ng-href="{{ config.webServerOrigin }}/documentation/storage/#app-data-directory" class="help" target="_blank"><i class="fa fa-question-circle"></i></a></sup></label>
             <p>
               By default, this app's data is located at <code>/home/yellowtent/appsdata/{{ app.id }}</code>. If the server is running out of disk space,
-              you can mount an external disk and move this app's data there.
+              you can mount an external disk and move this app's data there. Only Ext4 and NFS mounts are supported.
             </p>
             <form role="form" name="resourcesDataDirForm" ng-submit="resources.submitDataDir()" autocomplete="off">
               <fieldset>