How to Force Comments When Doing Check-In in TFS

I was looking for a policy like this, and found this blog article by Claus Konrad:

http://blog.clauskonrad.net/2010/08/tfs-2010-how-to-force-comments-when.html

Now, unfortunately everyone in the project has to have the TFS Power Tools installed to make this work.

The power tools can be downloaded from the Visual Studio Gallery, this is a direct link to it:

http://visualstudiogallery.msdn.microsoft.com/c255a1e4-04ba-4f68-8f4e-cd473d6b971f?SRC=VSIDE

Whish this was in the box from start.