diff --git a/autogen/retrieve_utils.py b/autogen/retrieve_utils.py
index e20fec9656..774e5e57d3 100644
--- a/autogen/retrieve_utils.py
+++ b/autogen/retrieve_utils.py
@@ -52,6 +52,7 @@
     "yaml",
     "yml",
     "pdf",
+    "mdx",
 ]
 UNSTRUCTURED_FORMATS = [
     "doc",
diff --git a/test/test_retrieve_utils.py b/test/test_retrieve_utils.py
index 18bb1ea23f..f9e8d71b74 100755
--- a/test/test_retrieve_utils.py
+++ b/test/test_retrieve_utils.py
@@ -226,7 +226,7 @@ def test_retrieve_utils(self):
             dir_path="./website/docs",
             client=client,
             collection_name="autogen-docs",
-            custom_text_types=["txt", "md", "rtf", "rst"],
+            custom_text_types=["txt", "md", "rtf", "rst", "mdx"],
             get_or_create=True,
         )
         results = query_vector_db(