diff --git a/src/main/java/de/metas/ui/web/window/controller/WindowRestController.java b/src/main/java/de/metas/ui/web/window/controller/WindowRestController.java
index c05eeffc8..57daf2c2c 100644
--- a/src/main/java/de/metas/ui/web/window/controller/WindowRestController.java
+++ b/src/main/java/de/metas/ui/web/window/controller/WindowRestController.java
@@ -337,6 +337,7 @@ public JSONDocument duplicate(
 		
 		final DocumentPath fromDocumentPath = DocumentPath.rootDocumentPath(WindowId.fromJson(windowIdStr), DocumentId.of(documentIdStr));
 		
+		// NOTE: deliberately we are not running in a transaction so basically we will ask the duplicate method to copy as much as it can ;)
 		final Document documentCopy = documentCollection.duplicateDocument(fromDocumentPath);
 		return JSONDocument.ofDocument(documentCopy, newJSONOptions().setShowAdvancedFields(advanced).build());
 	}