diff --git a/README.rst b/README.rst
index 29914f5..526c5dd 100644
--- a/README.rst
+++ b/README.rst
@@ -88,7 +88,7 @@ See the full `Document Loader`_ tutorial.
 .. _`Document Loader`: https://github.com/googleapis/langchain-google-cloud-sql-mssql-python/blob/main/docs/document_loader.ipynb
 
 Chat Message History Usage
---------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Use ``ChatMessageHistory`` to store messages and provide conversation
 history to LLMs.