diff --git a/reference/pgsql/functions/pg-trace.xml b/reference/pgsql/functions/pg-trace.xml
index d6764b4e8..cfe0f9b5a 100755
--- a/reference/pgsql/functions/pg-trace.xml
+++ b/reference/pgsql/functions/pg-trace.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: dallas Status: ready -->
+<!-- EN-Revision: 4d566363a3a23a4567803a8bad779e66d7199d79 Maintainer: dallas Status: ready -->
 <!-- CREDITS: mowangjuanzi -->
 <!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.7 -->
 <refentry xml:id="function.pg-trace" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
@@ -16,6 +16,7 @@
    <methodparam><type>string</type><parameter>filename</parameter></methodparam>
    <methodparam choice="opt"><type>string</type><parameter>mode</parameter><initializer>"w"</initializer></methodparam>
    <methodparam choice="opt"><type class="union"><type>PgSql\Connection</type><type>null</type></type><parameter>connection</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>trace_mode</parameter><initializer>0</initializer></methodparam>
   </methodsynopsis>
   <para>
    <function>pg_trace</function> 启用 PostgreSQL 前后端通讯的追踪并记录到文件。要完全理解结果，需要熟悉 PostgreSQL 通讯协议的内部工作原理。