diff --git a/docling/models/readingorder_model.py b/docling/models/readingorder_model.py
index 84344862..e28601ba 100644
--- a/docling/models/readingorder_model.py
+++ b/docling/models/readingorder_model.py
@@ -213,7 +213,7 @@ class ReadingOrderModel:
                 # TODO: handle element.cluster.children.
                 # _add_child_elements(pic, doc, obj, pelem)
 
-            elif isinstance(element, ContainerElement):
+            elif isinstance(element, ContainerElement):  # Form, KV region
                 pass
                 # TODO: handle element.cluster.children.