Materials Tool

Where do I put VTFs to use with the materials tool? They didn’t show up when I put them in the materials folder.
The answer:
http://www.facepunch.com/showpost.php?p=8320633&postcount=5

[editline]09:30PM[/editline]

found the answer:
http://www.facepunch.com/showpost.php?p=8320633&postcount=5