diff --git a/book.toml b/book.toml
index 6b7f3f5..e81d588 100644
--- a/book.toml
+++ b/book.toml
@@ -19,4 +19,5 @@ git-repository-icon = "fa-git" #|fa-git-square
 [output.html.search]
 enable = true
 
-
+[output.html.fold]
+enabled = true