diff --git a/math/number_theory/notes.page b/math/number_theory/notes.page
index 3fefbee..8aa9228 100644
--- a/math/number_theory/notes.page
+++ b/math/number_theory/notes.page
@@ -1,6 +1,6 @@
 ---
 format: markdown
-toc: no
+toc: yes
 title: Number Theory Study Notes
 ...