diff --git a/reference/filesystem/functions/is-readable.xml b/reference/filesystem/functions/is-readable.xml
index c03ca10bfe..4d50392b32 100644
--- a/reference/filesystem/functions/is-readable.xml
+++ b/reference/filesystem/functions/is-readable.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.14 $ -->
+<!-- $Revision: 1.15 $ -->
 <refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.is-readable">
  <refnamediv>
   <refname>is_readable</refname>
@@ -67,7 +67,7 @@ if (is_readable($filename)) {
   <para>
    Keep in mind that PHP may be accessing the file as the user
    id that the web server runs as (often 'nobody'). Safe mode
-   limitations are not taken into account.
+   limitations are not taken into account before PHP 5.1.5.
   </para>
   &note.clearstatcache;
   &tip.fopen-wrapper.stat;