diff --git a/doc/source/index.rst b/doc/source/index.rst
index 89816af..55c9dff 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -1,8 +1,12 @@
 Distributed Database Middleware
 ===============================
 
+Distributed Database Middleware (DDM) removes database capacity and performance bottlenecks and resolves distributed expansion issues. It provides database and table sharding, read/write splitting, and elastic scaling, helping you handle highly concurrent access to massive volumes of data and improving database read/write performance.
+
 .. directive_wrapper::
    :class: container-sbv
 
    .. service_card::
-      :service_type: ddm
\ No newline at end of file
+      :service_type: ddm
+      :umn: This document describes basic concepts, functions, key terms, and FAQs of Distributed Database Middleware (DDM) and provides instructions for applying for and using DDM.
+      :api-ref: This document describes application programming interfaces (APIs) of Distributed Database Middleware (DDM) and provides API parameter description and example values.