diff --git a/ed1n/MapReduce-algorithms.tex b/ed1n/MapReduce-algorithms.tex
index 919e6bf..6b375ba 100644
--- a/ed1n/MapReduce-algorithms.tex
+++ b/ed1n/MapReduce-algorithms.tex
@@ -21,6 +21,15 @@
 \hyphenation{Page-Rank}
 \hyphenation{through-put}
 
+\usepackage{hyperref}
+\hypersetup{
+    colorlinks,
+    citecolor=black,
+    filecolor=black,
+    linkcolor=black,
+    urlcolor=black
+}
+
 \begin{document}
 \pagestyle{empty}
 \frontmatter %
@@ -50,7 +59,7 @@
 
 \clearpage %
 
-%\tableofcontents
+\tableofcontents
 
 \mainmatter