diff --git a/reference/dio/functions/dio-fcntl.xml b/reference/dio/functions/dio-fcntl.xml
index a6c0555452..4977076928 100644
--- a/reference/dio/functions/dio-fcntl.xml
+++ b/reference/dio/functions/dio-fcntl.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.7 $ -->
+<!-- $Revision: 1.8 $ -->
 <!-- splitted from ./en/functions/dio.xml, last change in rev 1.1 -->
   <refentry id="function.dio-fcntl">
    <refnamediv>
@@ -101,7 +101,7 @@
 
 $fd = dio_open('/dev/ttyS0', O_RDWR);
 
-if (dio_fcntl($fd, F_SETLK) == -1) {
+if (dio_fcntl($fd, F_SETLK, Array("type"=>F_WRLCK)) == -1) {
    // the file descriptor appears locked
    echo "The lock can not be cleared. It is held by someone else.";
 } else {