diff --git a/Doc/lectures.xml b/Doc/lectures.xml
index 3cd8e85e57116918c4e8786dfb77a548fefca1f4..1dd398036776af4a722eb308355b9f5f6d4ab834 100644
--- a/Doc/lectures.xml
+++ b/Doc/lectures.xml
@@ -92,7 +92,7 @@
 
   <xi:include href="preface.xml" xpointer="element(/1)"/>
 
-  <part annotations="forumId=7;" xml:id="sd1">
+  <part annotations="forumId=15;" xml:id="sd1">
     <title>113105 Software development 1</title>
 
     <xi:include href="Sd1/gettingStarted.xml" xpointer="element(/1)"/>