diff --git a/reference/array/functions/array-combine.xml b/reference/array/functions/array-combine.xml
index 4d189379ea..13bc316737 100644
--- a/reference/array/functions/array-combine.xml
+++ b/reference/array/functions/array-combine.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.9 $ -->
+<!-- $Revision: 1.10 $ -->
 <refentry xml:id="function.array-combine" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>array_combine</refname>
@@ -29,7 +29,8 @@
      <term><parameter>keys</parameter></term>
      <listitem>
       <para>
-       Array of keys to be used
+       Array of keys to be used. Illegal values for key will be
+       converted to <type>string</type>.
       </para>
      </listitem>
     </varlistentry>