diff --git a/mmv1/products/networkconnectivity/ServiceConnectionPolicies.yaml b/mmv1/products/networkconnectivity/ServiceConnectionPolicies.yaml
index 211c71d9735c..174943e84a94 100644
--- a/mmv1/products/networkconnectivity/ServiceConnectionPolicies.yaml
+++ b/mmv1/products/networkconnectivity/ServiceConnectionPolicies.yaml
@@ -167,6 +167,12 @@ properties:
             - !ruby/object:Api::Type::Integer
               name: code
               description: The status code, which should be an enum value of [google.rpc.Code][].
+            - !ruby/object:Api::Type::Array
+              name: details
+              description: |
+                A list of messages that carry the error details.
+              item_type: Api::Type::KeyValuePairs
+              output: true
         - !ruby/object:Api::Type::String
           name: gceOperation
           description: |