diff --git a/reference/filesystem/functions/rename.xml b/reference/filesystem/functions/rename.xml
index 57e68dd17a..c3e98f1e7d 100644
--- a/reference/filesystem/functions/rename.xml
+++ b/reference/filesystem/functions/rename.xml
@@ -87,8 +87,12 @@
       <row>
        <entry>4.3.3</entry>
        <entry>
-        <function>rename</function> is now able to rename files across
-        partitions on *nix based systems.
+        <function>rename</function> may now be able to rename files across
+        partitions on *nix based systems, provided the appropriate permissions
+        are held. Warnings may be generated if the destination filesystem
+        doesn't permit <literal>chown()</literal> or
+        <literal>chmod()</literal> system calls to be made on files &mdash;
+        for example, if the destination filesystem is a FAT filesystem.
        </entry>
       </row>
      </tbody>