diff --git a/mmv1/products/compute/Address.yaml b/mmv1/products/compute/Address.yaml
index 1943923eb54b..1a8153b6024a 100644
--- a/mmv1/products/compute/Address.yaml
+++ b/mmv1/products/compute/Address.yaml
@@ -188,6 +188,10 @@ properties:
       configure Private Service Connect. Only global internal addresses can use
       this purpose.
 
+      * SYSTEM_MANAGED for regional internal IP address that is reserved and
+      managed internally. It can not be assigned to compute resources such as
+      VM and internal load balancer.
+
       This should only be set when using an Internal address.
     default_from_api: true
   - name: 'networkTier'