diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index 854c8ba..93ba2f5 100644
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -1,4 +1,4 @@
-*vi_diff.txt*   For Vim version 7.1.  Last change: 2007 May 07
+*vi_diff.txt*   For Vim version 7.1.  Last change: 2007 Aug 14
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -827,6 +827,8 @@
 
 --socketid {id}		Vim: GTK window socket to run Vim in
 
+--windowid {id}		Vim: Win32 window ID to run Vim in
+
 --version	Vim: show version message and exit.
 
 -?		Vile: print usage summary and exit.