diff --git a/reference/pcre/pattern.syntax.xml b/reference/pcre/pattern.syntax.xml
index 7e48590e38..ab5a49ef7f 100644
--- a/reference/pcre/pattern.syntax.xml
+++ b/reference/pcre/pattern.syntax.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
 <!-- splitted from ./en/functions/pcre.xml, last change in rev 1.2 -->
-<chapter xml:id="reference.pcre.pattern.syntax" xmlns="http://docbook.org/ns/docbook">
+<chapter xml:id="reference.pcre.pattern.syntax" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Pattern Syntax</title>
  <titleabbrev>PCRE regex syntax</titleabbrev>
 
@@ -1276,6 +1276,10 @@
   <para>
    In UTF-8 mode, characters with values greater than 128 do not match any
    of the POSIX character classes.
+   As of PHP 5.3.0 and libpcre 8.10 some character classes are changed to use
+   Unicode character properties, in which case the mentioned restriction does
+   not apply. Refer to the <link xlink:href="&url.pcre.man;">PCRE(3) manual</link>
+   for details.
   </para>
   <para>
    Unicode character properties can appear inside a character class. They can