diff --git a/appendices/migration84/new-features.xml b/appendices/migration84/new-features.xml
index 61b95db924f9..e88094e3b857 100644
--- a/appendices/migration84/new-features.xml
+++ b/appendices/migration84/new-features.xml
@@ -23,7 +23,7 @@
 <?php
 class Person
 {
-    // A "virtual" property.  It may not be set explicitly.
+    // A "virtual" property.  It can not be set explicitly.
     public string $fullName {
         get => $this->firstName . ' ' . $this->lastName;
     }
@@ -52,6 +52,8 @@ $p->firstName = 'peter';
 print $p->firstName; // Prints "Peter"
 $p->lastName = 'Peterson';
 print $p->fullName; // Prints "Peter Peterson"
+
+$p->fullName = "Peter 'Pete' Peterson"; // Fatal error: Property is read-only
 ]]>
     </programlisting>
    </informalexample>