diff --git a/Doc/Sda1/prerequisites.xml b/Doc/Sda1/prerequisites.xml
index 8cfa95eb532ec896cef5eac7376118e08a0f7d83..be7990854f22247721179e44138478568cd1e1e6 100644
--- a/Doc/Sda1/prerequisites.xml
+++ b/Doc/Sda1/prerequisites.xml
@@ -48,13 +48,13 @@
         <glossdef>
           <para>The lecture notes contain exercises to be solved by you! A
           complete list is available at <uri
-          xlink:href="https://freedocs.mi.hdm-stuttgart.de/topic/de.hdm_stuttgart.mi.freedocs/apd.html">https://freedocs.mi.hdm-stuttgart.de/topic/de.hdm_stuttgart.mi.freedocs/apd.html</uri>.</para>
+          xlink:href="apd.html">apd.html</uri>.</para>
 
           <para>You may also want to use the corresponding PDF version of the
           above table within <filename
-          xlink:href="printversion.pdf">printversion.pdf</filename>
-          to keep track of your personal advances by filling in your
-          completion status on individual exercises.</para>
+          xlink:href="printversion.pdf">printversion.pdf</filename> to keep
+          track of your personal advances by filling in your completion status
+          on individual exercises.</para>
         </glossdef>
       </glossentry>