diff --git a/google/cloud/irm/irm_v1alpha2.yaml b/google/cloud/irm/irm_v1alpha2.yaml
index dd6a98be..ad25d24b 100644
--- a/google/cloud/irm/irm_v1alpha2.yaml
+++ b/google/cloud/irm/irm_v1alpha2.yaml
@@ -10,3 +10,9 @@ documentation:
   overview: |-
     The Stackdriver Incident Response & Management API provides access to
     incident data.
+
+authentication:
+  rules:
+  - selector: '*'
+    oauth:
+      canonical_scopes: https://www.googleapis.com/auth/cloud-platform