diff --git a/reference/outcontrol/functions/ob-start.xml b/reference/outcontrol/functions/ob-start.xml
index aebec99e14..c43898c50a 100644
--- a/reference/outcontrol/functions/ob-start.xml
+++ b/reference/outcontrol/functions/ob-start.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.10 $ -->
+<!-- $Revision: 1.11 $ -->
 <!-- splitted from ./en/functions/outcontrol.xml, last change in rev 1.1 -->
   <refentry id="function.ob-start">
    <refnamediv>
@@ -10,9 +10,9 @@
     <title>Description</title>
      <methodsynopsis>
       <type>bool</type><methodname>ob_start</methodname>
-      <methodparam choice="opt"><type>callback</type><parameter>
-        output_callback
-       </parameter></methodparam>
+      <methodparam choice="opt"><type>callback</type><parameter>output_callback</parameter></methodparam>
+      <methodparam choice="opt"><type>int</type><parameter>chunk_size</parameter></methodparam>
+      <methodparam choice="opt"><type>bool</type><parameter>erase</parameter></methodparam>
      </methodsynopsis>
     <para>
      This function will turn output buffering on. While output
@@ -38,6 +38,11 @@
      expected to return a new output buffer as a result, which will be
      sent to the browser. If the <parameter>output_callback</parameter> is not
      a callable function, this function will return &false;.
+     If the callback function has two parameters, the second parameter is filled
+     with the bit-field consisting of
+     <constant>PHP_OUTPUT_HANDLER_START</constant>,
+     <constant>PHP_OUTPUT_HANDLER_CONT</constant> and
+     <constant>PHP_OUTPUT_HANDLER_END</constant>.
     </para>
     <note>
      <para>
@@ -54,6 +59,16 @@
       <parameter>output_callback</parameter> can not be executed.
      </para>
     </note>
+    <para>
+     If an optional parameter <parameter>chunk_size</parameter> is passed, the
+     callback function is called on every first newline after
+     <parameter>chunk_size</parameter> bytes of output.
+    </para>
+    <para>
+     If an optional parameter <parameter>erase</parameter> is set to &false;
+     buffer may not be deleted until script finishes. It is available since
+     PHP 4.3.0.
+    </para>
     <para>
      Output buffers are stackable, that is, you may call
      <function>ob_start</function> while another