diff --git a/index.rst b/index.rst
index 0c88595ca4e134df8e345dcb0ff869c87ea19a63..403c6f4f046393abd3abf5685c9a069210c673a6 100644
--- a/index.rst
+++ b/index.rst
@@ -21,7 +21,7 @@ will be flexible enough to target a wide range of devices that accompany users'
 daily life.
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 2
       
    overview/index
    meta-ohos/index