diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 7f2aa94..6b8281a 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -2641,6 +2641,14 @@
   HTTP/1.1 204 No Content
 ----
 
+When the change edit is a no-op, for example when providing the same file
+content that the file already has, '409 no changes were made' is returned.
+
+.Response
+----
+  HTTP/1.1 409 no changes were made
+----
+
 [[post-edit]]
 === Restore file content or rename files in Change Edit
 --