diff --git a/config/_default/markup.toml b/config/_default/markup.toml
index 07e9feb..2ff5a0a 100644
--- a/config/_default/markup.toml
+++ b/config/_default/markup.toml
@@ -14,4 +14,4 @@
 
 [tableOfContents]
   startLevel = 2
-  endLevel = 2
+  endLevel = 4