diff --git a/plinth/modules/nextcloud/__init__.py b/plinth/modules/nextcloud/__init__.py
index e5e30255a..7a3870df3 100644
--- a/plinth/modules/nextcloud/__init__.py
+++ b/plinth/modules/nextcloud/__init__.py
@@ -32,6 +32,8 @@ _description = [
           'legal reviews are done by the upstream project and not by '
           'Debian/{box_name}. Updates are performed following an independent '
           'cycle.'), box_name=_(cfg.box_name)),
+    format_lazy('<div class="alert alert-warning" role="alert">{}</div>',
+                _('This app is experimental.')),
 ]