diff --git a/_toc.yml b/_toc.yml
index 1ca6e9aa..c9514db4 100644
--- a/_toc.yml
+++ b/_toc.yml
@@ -4,7 +4,7 @@
 root: index
 format: jb-book
 defaults:
-  maxdepth: 2
+  maxdepth: 3
 
 chapters:
   - file: user-guide/index