diff --git a/format/math.tex b/format/math.tex
index 00f33f8..790082f 100644
--- a/format/math.tex
+++ b/format/math.tex
@@ -8,6 +8,8 @@
 \usepackage{mathrsfs}
 \usepackage{bbold}
 \usepackage[framemethod=TikZ]{mdframed}
+\usepackage{tikz}
+\usetikzlibrary{automata,arrows}
 
 % ------------------------------------ %