installer: core-auth
diff --git a/core/installer/values-tmpl/core-auth.jsonschema b/core/installer/values-tmpl/core-auth.jsonschema
index f42d895..a7ccc8d 100644
--- a/core/installer/values-tmpl/core-auth.jsonschema
+++ b/core/installer/values-tmpl/core-auth.jsonschema
@@ -1,6 +1,7 @@
 {
   "type": "object",
   "properties": {
+    "Subdomain": { "type": "string" }
   },
   "additionalProperties": false
 }