diff --git a/book/_toc.yml b/book/_toc.yml
index 1df9e2192791f8adfdb670ccb32c51b8404ffc06..4e238a1c17c7a2b93ab64ce2b70a38fc0720d127 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -4,7 +4,7 @@ root: intro
 
 parts:
   - caption: Q1 Topics
-    numbered: 2
+    numbered: true
     chapters: 
     - file: modeling/overview
       title: Modeling