Note for windows users on the upgrade script

docs/upgrading.rst

@@ -59,6 +59,13 @@ Please note that deprecation warnings are disabled by default starting
 with Python 2.7.  In order to see the deprecation warnings that might be
 emitted you have to enabled them with the :mod:`warnings` module.
 
+If you are working with windows and you lack the `patch` command line
+utility you can get it as part of various Unix runtime environments for
+windows including cygwin, msysgit or ming32.  Also source control systems
+like svn, hg or git have builtin support for applying unified diffs as
+generated by the tool.  Check the manual of your version control system
+for more information.
+
 
 Bug in Request Locals
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