diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index a9879e9741b00e2b4f33c5ab712b311c39a55a06..8f611eeb14018da136a4137379eb799e7d62395a 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -311,8 +311,8 @@ javac 1.8.0_91</programlisting>
           <quote>git</quote> perspective in Eclipse (right upper corner open
           <guimenu>Open perspective</guimenu>). Then choose <quote>Clone a Git
           repository</quote> and enter
-          <code>https://gitlab.mi.hdm-stuttgart.de/goik/GoikLectures.git</code> in
-          the URI field:</para>
+          <code>https://gitlab.mi.hdm-stuttgart.de/goik/GoikLectures.git</code>
+          in the URI field:</para>
 
           <mediaobject>
             <imageobject>
@@ -334,7 +334,10 @@ javac 1.8.0_91</programlisting>
           </informalfigure>
 
           <programlisting language="none">git clone https://gitlab.mi.hdm-stuttgart.de/goik/GoikLectures</programlisting>
-          <para>You may as well check out via ssh if a suitable key is being configured:</para>
+
+          <para>You may as well check out via ssh if a suitable key is being
+          configured:</para>
+
           <programlisting language="none">git clone git@gitlab.mi.hdm-stuttgart.de:goik/GoikLectures.git</programlisting>
         </listitem>
 
@@ -976,6 +979,11 @@ public class Rectangle {
           <qandadiv>
             <qandaentry>
               <question>
+                <para>This exercise is very similar to <xref
+                linkend="sd1ImplementRectangle"/>. With respect to the
+                upcoming section on inheritance its presence will be justified
+                later by <xref linkend="sw1SectGeometryInherit"/>.</para>
+
                 <para>We provide a corresponding class
                 <classname>Circle</classname> dummy implementation:</para>