diff --git a/httpstatuscodes.html b/httpstatuscodes.html
index 7a3bf8a..924ff33 100644
--- a/httpstatuscodes.html
+++ b/httpstatuscodes.html
@@ -807,7 +807,7 @@
 									<li><a href="lessons/restquicktips.html">REST Quick Tips</a></li>
 									<li><a href="lessons/httpmethods.html">HTTP Methods</a></li>
 									<li><a href="lessons/restfulresourcenaming.html">Resource Naming</a></li>
-									<li><a href="idempotency.html">Idempotence</a></li>
+									<li><a href="lessons/idempotency.html">Idempotence</a></li>
 								</ul>
 							</li>
 							<li class="active"><a href="httpstatuscodes.html">HTTP Status Codes</a></li>
diff --git a/sitemap.xml b/sitemap.xml
index a602f1b..bf21912 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -34,7 +34,7 @@
 </url>
 <url>
   <loc>http://www.restapitutorial.com/resources.html</loc>
-  <lastmod>2013-09-21T14:55:39+00:00</lastmod>
+  <lastmod>2013-21-21T14:55:39+00:00</lastmod>
 </url>
 <url>
   <loc>http://www.restapitutorial.com/index.html</loc>