diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
index 28743310b2cc..4cfc0d074320 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
@@ -1980,6 +1980,9 @@
         "autoScalerProfile": {
           "type": "object",
           "properties": {
+            "balance-similar-node-groups": {
+              "type": "boolean"
+            },
             "scan-interval": {
               "type": "string"
             },