diff --git a/trees/index.tree b/trees/index.tree
index 9bdf9bb..e8fb76c 100644
--- a/trees/index.tree
+++ b/trees/index.tree
@@ -20,8 +20,8 @@
 
 \p{\strong{[PDF version coming soon]}}
 
-\p{
-  \strong{Table of contents}
+\subtree{
+  \title{Table of contents}
 
   \ul{
     \li{