diff --git a/Doc/Sd1/objectsClasses.xml b/Doc/Sd1/objectsClasses.xml
index 2585f84fe689a0db51e358260d595a2d61691774..3642c9e59bc44583e44270be85348374043677e9 100644
--- a/Doc/Sd1/objectsClasses.xml
+++ b/Doc/Sd1/objectsClasses.xml
@@ -10531,6 +10531,43 @@ class_wrapper_private.Day'</emphasis></screen></td>
   }
 }</programlisting>
       </figure>
+
+      <figure xml:id="sd1_fig_enumOnlyPrivateConstructor">
+        <title> Constructor implicitly <code
+        language="java">private</code></title>
+
+        <informaltable border="0">
+          <colgroup width="36%"/>
+
+          <colgroup width="64%"/>
+
+          <tr>
+            <td valign="top"><programlisting language="java">public enum Day {
+  ...
+  <emphasis role="red">private</emphasis> Day(final String name)
+    { ...</programlisting></td>
+
+            <td valign="top"><para>Compile time warning:</para><para><emphasis
+            role="red">Modifier 'private' is redundant for <code
+            language="java">enum</code> constructors</emphasis></para></td>
+          </tr>
+
+          <tr>
+            <td valign="top"><programlisting language="java">public enum Day {
+  ...
+  <emphasis role="red">public</emphasis> Day(final String name)
+    { ...</programlisting></td>
+
+            <td valign="top"><para>Compile time error:</para><para><emphasis
+            role="red">Modifier 'public' not allowed
+            here</emphasis></para></td>
+          </tr>
+        </informaltable>
+
+        <para>Prohibits <link
+        linkend="sd1_fig_preventUndesiredDayCreation"><code
+        language="java">enum</code> external instance creation</link>.</para>
+      </figure>
     </section>
   </section>
 
@@ -11076,11 +11113,11 @@ Results :
     </section>
 
     <section xml:id="sd1_sect_junitDetails">
-      <title><xref linkend="glo_Junit"/>, important details</title>
+      <title>Helpful <xref linkend="glo_Junit"/> methods</title>
 
       <info>
         <abstract>
-          <para>Selected assert methods.</para>
+          <para>Selected assertion methods.</para>
 
           <para>Considerations when comparing <code>float</code> and
           <code>double</code> values.</para>
@@ -11485,5 +11522,51 @@ Elapsed time: 25422 nanoseconds</screen>
         </qandadiv>
       </qandaset>
     </section>
+
+    <section xml:id="sd1_sect_junitTechDetails">
+      <title>Technical details</title>
+
+      <info>
+        <abstract>
+          <para><xref linkend="glo_Junit"/> Building Blocks: Classes and
+          interfaces</para>
+
+          <para>Integration using <xref linkend="glo_Maven"/>.</para>
+        </abstract>
+      </info>
+
+      <figure xml:id="sd1_fig_junitTestAnnotation">
+        <title>The <interfacename
+        xlink:href="https://github.com/junit-team/junit4/blob/master/src/main/java/org/junit/Test.java">@Test</interfacename>
+        annotation</title>
+
+        <informaltable border="0">
+          <colgroup width="26%"/>
+
+          <colgroup width="74%"/>
+
+          <tr>
+            <td valign="top"><programlisting language="java">...
+public
+@interface <link xlink:href="https://github.com/junit-team/junit4/blob/master/src/main/java/org/junit/Test.java">Test</link> {
+...
+}</programlisting></td>
+
+            <td valign="top"><itemizedlist>
+                <listitem>
+                  <para><interfacename>@interface</interfacename> defining an
+                  <link
+                  xlink:href="https://docs.oracle.com/javase/tutorial/java/annotations">annotation</link>.</para>
+                </listitem>
+
+                <listitem>
+                  <para>Purpose: Allows for automatic detection of test
+                  methods.</para>
+                </listitem>
+              </itemizedlist></td>
+          </tr>
+        </informaltable>
+      </figure>
+    </section>
   </section>
 </chapter>