diff --git a/index.xhtml b/index.xhtml
index ad8e24b..9682f28 100644
--- a/index.xhtml
+++ b/index.xhtml
@@ -63,6 +63,7 @@
 			<li><a href="data/">data</a></li>
 			<li><a href="data-engineer/">data-engineer</a></li>
 			<li><a href="data-engineering/">data-engineering</a></li>
+			<li><a href="data-normalization/">data-normalization</a></li>
 			<li><a href="data-science/">data-science</a></li>
 			<li><a href="data-scientist/">data-scientist</a></li>
 			<li><a href="database/">database</a></li>
@@ -108,6 +109,7 @@
 		<h2>I</h2>
 		<ul>
 			<li><a href="interval-data/">interval-data</a></li>
+			<li><a href="interval-data-normalization/">interval-data-normalization</a></li>
 			<li><a href="introduction/">introduction</a></li>
 		</ul>
 	</section>
@@ -150,6 +152,7 @@
 			<li><a href="naive-bayes/">naive-bayes</a></li>
 			<li><a href="natural-language-processing/">natural-language-processing</a></li>
 			<li><a href="nominal-data/">nominal-data</a></li>
+			<li><a href="nominal-data-normalization/">nominal-data-normalization/</a></li>
 			<li><a href="non-linear/">non-linear</a></li>
 		</ul>
 	</section>
@@ -159,6 +162,7 @@
 			<li><a href="online-advertising/">online-advertising</a></li>
 			<li><a href="optical-character-recognition/">optical-character-recognition</a></li>
 			<li><a href="ordinal-data/">ordinal-data</a></li>
+			<li><a href="ordinal-data-normalization/">ordinal-data-normalization</a></li>
 		</ul>
 	</section>
 	<section id="P">
@@ -188,6 +192,7 @@
 			<li><a href="r-programming-language/">r-programming-language</a></li>
 			<li><a href="random-forest/">random-forest</a></li>
 			<li><a href="ratio-data/">ratio-data</a></li>
+			<li><a href="ratio-data-normalization/">ratio-data-normalization</a></li>
 			<li><a href="recurrent-neural-network/">recurrent-neural-network</a></li>
 			<li><a href="regression/">regression</a></li>
 			<li><a href="reinforcement-learning/">reinforcement-learning</a></li>