diff --git a/documentation/adt-manual/adt-intro.xml b/documentation/adt-manual/adt-intro.xml
index 211b174dc6..9ae908fc11 100644
--- a/documentation/adt-manual/adt-intro.xml
+++ b/documentation/adt-manual/adt-intro.xml
@@ -114,7 +114,7 @@
                 <listitem><para><emphasis>Perf:</emphasis> Performance counters for Linux used 
                     to keep track of certain types of hardware and software events.  
                     For more information on these types of counters see 
-                    <ulink url='https://perf.wiki.kernel.org/index.php'></ulink> and click 
+                    <ulink url='https://perf.wiki.kernel.org/'></ulink> and click 
                     on “Perf tools.”</para></listitem>
                 <listitem><para><emphasis>SystemTap:</emphasis> A free software infrastructure 
                     that simplifies information gathering about a running Linux system.