diff --git a/book/_toc.yml b/book/_toc.yml
index 6e06b239..b6474dd7 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -8,7 +8,7 @@ parts:
     chapters:
     - file: about_cookbook
       title: About this Cookbook
-      sctions:
+      sections:
         - file: iupacfair
     - file: contributions
     - file: feedback