diff --git a/homework.tex b/homework.tex
index 872e6f5..7376aff 100644
--- a/homework.tex
+++ b/homework.tex
@@ -8,6 +8,7 @@
 \usepackage{tikz}
 \usepackage[plain]{algorithm}
 \usepackage{algpseudocode}
+\usepackage{bold-extra}
 
 \usetikzlibrary{automata,positioning}