diff --git a/book/basics/how-sourdough-works.tex b/book/basics/how-sourdough-works.tex
index bd7085b..be00c4b 100644
--- a/book/basics/how-sourdough-works.tex
+++ b/book/basics/how-sourdough-works.tex
@@ -1,3 +1,5 @@
+\chapter{How sourdough works}%
+\label{ch:how-sourdough-works}
 \begin{quoting}
 In this chapter, we will cover the basics of how sourdough ferments.
 First, we will look at the enzymatic reactions that take place
diff --git a/book/book.tex b/book/book.tex
index aaa3b6f..5684eb7 100644
--- a/book/book.tex
+++ b/book/book.tex
@@ -26,7 +26,6 @@
 
 \input{history/sourdough-history}
 
-\chapter{How sourdough works}
 \input{basics/how-sourdough-works}
 
 \chapter{Making a sourdough starter}