diff --git a/raystack/frontier/v1beta1/models.proto b/raystack/frontier/v1beta1/models.proto
index d14092d2..3e6a786d 100644
--- a/raystack/frontier/v1beta1/models.proto
+++ b/raystack/frontier/v1beta1/models.proto
@@ -614,6 +614,7 @@ message Subscription {
   message Phase {
     google.protobuf.Timestamp effective_at = 1;
     string plan_id = 2;
+    string reason = 3;
   }
   repeated Phase phases = 20;