diff --git a/charts/base-cluster/values.schema.json b/charts/base-cluster/values.schema.json
index 6ae5d46ad8..df8a8e2611 100644
--- a/charts/base-cluster/values.schema.json
+++ b/charts/base-cluster/values.schema.json
@@ -1437,6 +1437,7 @@
           "enum": [
             "nginx",
             "traefik",
+            "external",
             "none"
           ],
           "description": "Which ingress controller to use"