diff --git a/docs/architecture-decisions/0007-result-message-spec.md b/docs/architecture-decisions/0007-result-message-spec.md
index 125fafc..c594d0f 100644
--- a/docs/architecture-decisions/0007-result-message-spec.md
+++ b/docs/architecture-decisions/0007-result-message-spec.md
@@ -89,6 +89,8 @@ MessageBody = {
 ```json
 MessageBody = {
     "ResultType": "error",
+    "ErrorTimestamp": "Timestamp when the error occurred. Provided to help external
+        service maintainers investigate the issue",
     "ErrorInfo": "Information provided by the DSpace Submission Service about
         where in the process the error occurred, e.g. 'Error occurred while
         posting item to DSpace'",