diff --git a/doc/make-pdf.sh b/doc/make-pdf.sh
index 648e4003c..04803c16c 100755
--- a/doc/make-pdf.sh
+++ b/doc/make-pdf.sh
@@ -34,6 +34,8 @@ cat >> book.tex <<EOF
     basicstyle=\ttfamily
 }
 
+\raggedbottom
+
 \begin{document}
 
 \setlength{\parindent}{0cm}