diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index fae0c7832b..babe9bd2d6 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1154,9 +1154,17 @@
     <para>
         The <filename>image-live</filename> class supports building "live"
         images.
+    </para>
+
+    <para>
         Normally, you do not use this class directly.
         Instead, you add "live" to
         <link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>.
+        For example, if you were building an ISO image, you would add "live"
+        to <filename>IMAGE_FSTYPES</filename>, set the
+        <link linkend='var-NOISO'><filename>NOISO</filename></link> variable to
+        "0" and the build system would use the <filename>image-live</filename>
+        class to build the ISO image.
     </para>
 </section>