diff --git a/Documentation/index.rst b/Documentation/index.rst
index 213399a..18b2484 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -20,6 +20,17 @@
    gpu/index
    80211/index
 
+Architecture-specific documentation
+-----------------------------------
+
+These books provide programming details about architecture-specific
+implementation.
+
+.. toctree::
+   :maxdepth: 2
+
+   x86/index
+
 Indices and tables
 ==================