diff --git a/src/Sdk/DTWebApi/WebApi/TimelineRecordState.cs b/src/Sdk/DTWebApi/WebApi/TimelineRecordState.cs
index 5b08aff24..77f0dbf84 100644
--- a/src/Sdk/DTWebApi/WebApi/TimelineRecordState.cs
+++ b/src/Sdk/DTWebApi/WebApi/TimelineRecordState.cs
@@ -13,5 +13,8 @@ namespace GitHub.DistributedTask.WebApi
 
         [EnumMember]
         Completed,
+
+        [EnumMember]
+        Delayed,
     }
 }