diff --git a/main.tex b/main.tex
index 9d6cc86..425e749 100644
--- a/main.tex
+++ b/main.tex
@@ -15,6 +15,7 @@
 \chapterstyle{madsen}
 
 \usepackage{xcolor, graphicx}
+\usepackage{subfig}
 \usepackage[pagebackref]{hyperref}
 \renewcommand*{\backref}[1]{}
 \renewcommand*{\backrefalt}[4]{\small Citations: \S{}~#4}