diff --git a/Doc/lectures.xml b/Doc/lectures.xml
index 1385f21f63ef4fa8bd71bbdc5323421a86b8e590..283ba9604a3c51f1781f7e9d5a3eb4b1123f59df 100644
--- a/Doc/lectures.xml
+++ b/Doc/lectures.xml
@@ -50,7 +50,10 @@
 
         <tr>
           <th colspan="1">Available as <link
-          linkend="prefaceFormatHtmlWebhelp">HTML</link>, EPUB and PDF.</th>
+          linkend="prefaceFormatHtmlWebhelp">HTML</link>, <link
+          linkend="prefaceFormatZip">zipped HTML</link>, <link
+          linkend="prefaceFormatEpub">EPUB</link> and <link
+          linkend="prefaceFormatPdf">PDF</link>.</th>
         </tr>
 
         <tr>
@@ -113,13 +116,14 @@
         </caution>
       </listitem>
 
-      <listitem>
+      <listitem xml:id="prefaceFormatZip">
         <para>Self contained zip archive <link
         xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/lectures.zip">lectures.zip</link>
         of above offline resources including <filename
         xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/printversion.pdf">printversion.pdf</filename>
         and <filename
-        xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/lectures.epub">lectures.epub</filename>.</para>
+        xlink:href="https://freedocs.mi.hdm-stuttgart.de/webhelp/lectures.epub">lectures.epub</filename>
+        for offline usage.</para>
       </listitem>
     </itemizedlist>
   </preface>
@@ -173,6 +177,7 @@
     <xi:include href="Sda1/jdbc.xml" xpointer="element(/1)"/>
 
     <xi:include href="Sda1/jpaintro.xml" xpointer="element(/1)"/>
+
     <xi:include href="Sda1/mongodb.xml" xpointer="element(/1)"/>
 
     <appendix>