diff --git a/reference/http/functions/header.xml b/reference/http/functions/header.xml
index 9d9f659a13..8816592b57 100644
--- a/reference/http/functions/header.xml
+++ b/reference/http/functions/header.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.29 $ -->
+<!-- $Revision: 1.30 $ -->
 <!-- splitted from ./en/functions/http.xml, last change in rev 1.2 -->
   <refentry id="function.header">
    <refnamediv>
@@ -15,11 +15,17 @@
       <methodparam choice="opt"><type>int</type><parameter>http_response_code</parameter></methodparam>
      </methodsynopsis>
     <para>
-     <function>header</function> is used to send raw
-     <acronym>HTTP</acronym> headers.  See the <ulink
+     <function>header</function> is used to send a raw
+     <acronym>HTTP</acronym> header.  See the <ulink
      url="&url.rfc;2616">HTTP/1.1 specification</ulink> for more
      information on <acronym>HTTP</acronym> headers.
     </para>
+    <note>
+     <para>
+      Since PHP 5.1.2 this function prevents more than one header to be sent
+      at once as a protection against header injection attacks.
+     </para>
+    </note>
     <para>
      The optional <parameter>replace</parameter> parameter indicates
      whether the header should replace a previous similar header, or