diff --git a/book/source/index.md b/book/source/index.md
index b16a683..e56298d 100644
--- a/book/source/index.md
+++ b/book/source/index.md
@@ -1,8 +1,10 @@
-# OpenPGP for application developers, an introduction
+# OpenPGP for application developers
+
+**{sub-ref}`today`**
 
 ```{toctree}
 :numbered:
-:maxdepth: 3
+:maxdepth: 2
 :glob:
 
 *