Team Foundation Build 2010 - Check-in changed file during the build process

In my build workflow I change the assembly version information in AssemblyInfo.cs for 开发者_Python百科some class libraries. How can I check-in my changes at the end of the build process? From what I see there is no such activity.

I've found a blog post by Ewald Hofman on how to do exactly what I want:

http://www.ewaldhofman.nl/post/2010/05/13/Customize-Team-Build-2010-e28093-Part-5-Increase-AssemblyVersion.aspx