diff --git a/reference/array/functions/array-reverse.xml b/reference/array/functions/array-reverse.xml
index fe27d2a6b2..b60451848b 100644
--- a/reference/array/functions/array-reverse.xml
+++ b/reference/array/functions/array-reverse.xml
@@ -33,7 +33,8 @@
      <term><parameter>preserve_keys</parameter></term>
      <listitem>
       <para>
-       If set to &true; keys are preserved.
+       If set to &true; numeric keys are preserved. 
+       Non-numeric keys are not affected by this setting and will always be preserved.
       </para>
      </listitem>
     </varlistentry>