diff --git a/language/types/array.xml b/language/types/array.xml
index 9381f47f69aa..addd5200bc81 100644
--- a/language/types/array.xml
+++ b/language/types/array.xml
@@ -316,6 +316,57 @@ array(7) {
 ]]>
     </screen>
    </example>
+
+   <example>
+    <title>Negative index example</title>
+    <simpara>
+     When assigning a negative integer key <literal>n</literal>, PHP will take care to
+     assign the next key to <literal>n+1</literal>.
+    </simpara>
+    <programlisting role="php">
+     <![CDATA[
+<?php
+$array = [];
+
+$array[-5] = 1;
+$array[] = 2;
+
+var_dump($array);
+?>
+]]>
+    </programlisting>
+    &example.outputs;
+    <screen>
+     <![CDATA[
+array(2) {
+  [-5]=>
+  int(1)
+  [-4]=>
+  int(2)
+}
+]]>
+    </screen>
+
+    <warning>
+     <simpara>
+      Prior to PHP 8.3.0, assigning a negative integer key <literal>n</literal> would
+      assign the next key to <literal>0</literal>, the previous example would
+      therefore output:
+     </simpara>
+     <informalexample>
+      <screen>
+<![CDATA[
+array(2) {
+  [-5]=>
+  int(1)
+  [0]=>
+  int(2)
+}
+]]>
+      </screen>
+     </informalexample>
+    </warning>
+   </example>
   </sect3>
   
   <sect3 xml:id="language.types.array.syntax.accessing">