diff --git a/signal-server-openapi.yaml b/signal-server-openapi.yaml
index 81afbc235..1d3d5ca30 100644
--- a/signal-server-openapi.yaml
+++ b/signal-server-openapi.yaml
@@ -4688,6 +4688,9 @@ components:
             type: string
         hostname:
           type: string
+        ttl:
+          type: integer
+          format: int64
     DeliveryCertificate:
       type: object
       properties: