diff --git a/developer_manual/client_apis/OCS/index.rst b/developer_manual/client_apis/OCS/index.rst
index caef3afd7..af018fb61 100644
--- a/developer_manual/client_apis/OCS/index.rst
+++ b/developer_manual/client_apis/OCS/index.rst
@@ -4,6 +4,8 @@
 OCS API
 ===============================
 
+.. toctree::
+
    ocs-api-overview
    ocs-share-api
    ocs-sharee-api