diff --git a/Doc/lectures.xml b/Doc/lectures.xml
index 731ba494e51602c1abbf55a0c815f858b3951824..118b10a2d2ea3549c3c81c706bdf6727a908553f 100644
--- a/Doc/lectures.xml
+++ b/Doc/lectures.xml
@@ -225,10 +225,10 @@
 
     <xi:include href="Sdi/gettingStarted.xml" xpointer="element(/1)"/>
 
-    <xi:include href="Sdi/ldap.xml" xpointer="element(/1)"/>
-
     <xi:include href="Sdi/dns.xml" xpointer="element(/1)"/>
 
+    <xi:include href="Sdi/ldap.xml" xpointer="element(/1)"/>
+
     <xi:include href="Sdi/apache.xml" xpointer="element(/1)"/>
 
     <xi:include href="Sdi/samba.xml" xpointer="element(/1)"/>