diff --git a/Doc/Sd1/interfacesAbstractClasses.xml b/Doc/Sd1/interfacesAbstractClasses.xml
index 98e2d8095884e60fa12b844e8ece61cbf31316ed..21dafb992048c17aef5fa2d537d9c58c65ca8e1f 100644
--- a/Doc/Sd1/interfacesAbstractClasses.xml
+++ b/Doc/Sd1/interfacesAbstractClasses.xml
@@ -1054,8 +1054,8 @@ for (final String n: names) {
 }</programlisting><calloutlist>
               <callout arearefs="sd1_callout_StringSortIgnoreCaseLambda-1-co"
                        xml:id="sd1_callout_StringSortIgnoreCaseLambda-1">
-                <para>This expression is equivalent to the following custom
-                comparator:</para>
+                <para>This lambda expression is equivalent to the following
+                custom comparator:</para>
 
                 <programlisting language="none">public class SortDescending implements <link
                     xlink:href="https://docs.oracle.com/javase/10/docs/api/java/util/Comparator.html">Comparator</link>&lt;String&gt; {