diff --git a/main.tex b/main.tex
index 425e749..4c61822 100644
--- a/main.tex
+++ b/main.tex
@@ -16,6 +16,7 @@
 
 \usepackage{xcolor, graphicx}
 \usepackage{subfig}
+\usepackage{multirow}
 \usepackage[pagebackref]{hyperref}
 \renewcommand*{\backref}[1]{}
 \renewcommand*{\backrefalt}[4]{\small Citations: \S{}~#4}
@@ -86,6 +87,7 @@
 \input chap-ZK
 
 \part{Group Signatures and Anonymous Credentials}
+\label{pa:gs-ac}
 
 \input chap-sigmasig