diff --git a/src/template.latex b/src/template.latex
index d8f9139..17ee068 100644
--- a/src/template.latex
+++ b/src/template.latex
@@ -9,7 +9,7 @@ $if(linestretch)$
 \setstretch{$linestretch$}
 $endif$
 \usepackage{braket,cancel}
-\usepackage{amssymb,amsmath}
+\usepackage{amssymb,amsmath,mathtools}
 \usepackage{ifxetex,ifluatex}
 \usepackage{fixltx2e} % provides \textsubscript
 \ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex