diff --git a/CloudronManifest.json b/CloudronManifest.json
index b83e0e0..41116ff 100644
--- a/CloudronManifest.json
+++ b/CloudronManifest.json
@@ -31,5 +31,6 @@
   "changelog": "file://CHANGELOG",
   "postInstallMessage": "file://POSTINSTALL.md",
   "minBoxVersion": "5.1.4",
-  "documentationUrl": "https://cloudron.io/documentation/apps/synapse/"
+  "documentationUrl": "https://cloudron.io/documentation/apps/synapse/",
+  "optionalSso": true
 }