diff --git a/autogen/retrieve_utils.py b/autogen/retrieve_utils.py
index 6f423b30715..d65fabb440b 100644
--- a/autogen/retrieve_utils.py
+++ b/autogen/retrieve_utils.py
@@ -53,7 +53,7 @@
     "rtf",
     "rst",
     "xlsx",
-]
+]  # These formats will be parsed by the 'unstructured' library, if installed.
 if HAS_UNSTRUCTURED:
     TEXT_FORMATS += UNSTRUCTURED_FORMATS
     TEXT_FORMATS = list(set(TEXT_FORMATS))