diff --git a/Doc/lectures.xml b/Doc/lectures.xml
index 1b5dcbd56689a2465efc29e53d941b967fd1359b..6ee56377f7b95c06f9caaa73dc50d0217bfbe87f 100644
--- a/Doc/lectures.xml
+++ b/Doc/lectures.xml
@@ -112,7 +112,7 @@
 
   <xi:include href="preface.xml" xpointer="element(/1)"/>
 
-  <part annotations="forumId=16;" xml:id="sd1">
+  <part annotations="forumId=8;" xml:id="sd1">
     <title>113105 Software development 1</title>
 
     <xi:include href="Sd1/gettingStarted.xml" xpointer="element(/1)"/>