diff --git a/index.rmd b/index.rmd
index 73c104e..6f96336 100644
--- a/index.rmd
+++ b/index.rmd
@@ -10,6 +10,7 @@ This is the book site for __"R for data science"__. It will be published with O'
 
 <img src="cover.png" width="250" height="328" alt="Cover image" />
 
+## Table of contents
 
 <ul class="toc">
   {% include package-nav.html %}