diff --git a/doc/arch/index.rst b/doc/arch/index.rst
new file mode 100644
index 0000000..a03ee6b
--- /dev/null
+++ b/doc/arch/index.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Architecture-specific doc
+=========================
+
+.. toctree::
+   :maxdepth: 2
diff --git a/doc/index.rst b/doc/index.rst
index bc2f06a..6d42d94 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -40,6 +40,17 @@
 
    api/index
 
+Architecture-specific doc
+-------------------------
+
+These books provide programming details about architecture-specific
+implementation.
+
+.. toctree::
+   :maxdepth: 2
+
+   arch/index
+
 Indices and tables
 ==================