diff --git a/Documentation/sound/index.rst b/Documentation/sound/index.rst
index 64fe47a..e9fbbff 100644
--- a/Documentation/sound/index.rst
+++ b/Documentation/sound/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 2
 
    kernel-api/index
+   designs/index
    alsa-configuration
    hd-audio/index