diff --git a/trunk/RTCSA_SS/Main.tex b/trunk/RTCSA_SS/Main.tex
index 830c159..724d380 100644
--- a/trunk/RTCSA_SS/Main.tex
+++ b/trunk/RTCSA_SS/Main.tex
@@ -24,6 +24,7 @@
 %\usepackage{cases}
 %\usepackage{subfig}
 \usepackage{balance}
+\usepackage{xcolor}
 %\usepackage{algorithm}
 %\usepackage{algorithmic}
 %\usepackage[noend]{algpseudocode}