diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2021-03-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2021-03-01/managedClusters.json
index a8d67128f83c..8179fc9de7dc 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2021-03-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2021-03-01/managedClusters.json
@@ -3222,6 +3222,7 @@
             "rapid",
             "stable",
             "patch",
+            "node-image",
             "none"
           ],
           "x-ms-enum": {