diff --git a/src/template.latex b/src/template.latex
index 8186104..2665089 100644
--- a/src/template.latex
+++ b/src/template.latex
@@ -8,7 +8,7 @@ $if(linestretch)$
 \usepackage{setspace}
 \setstretch{$linestretch$}
 $endif$
-\usepackage{cancel}
+\usepackage{braket,cancel}
 \usepackage{amssymb,amsmath}
 \usepackage{ifxetex,ifluatex}
 \usepackage{fixltx2e} % provides \textsubscript