diff --git a/doc/source/index.rst b/doc/source/index.rst
index 53fb0eaae5db6dd74cf9c95cf1de699697659195..fc36bbe33a5f70f5744e02614f6d8cdae50b37d6 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -15,9 +15,12 @@ csst_proto
     :alt: Documentation Status
 
 
-Welcome to csst_proto
----------------------
+.. toctree::
+   :hidden:
+   :maxdepth: 1
+   :caption: csst_proto
 
+Welcome to csst_proto.
 `csst_proto` is the CSST L1 pipeline prototype.
 
 GitLab: