[hyltom]

Inside this note, the creator of the material can add a comment that explain how to tweak the material or whatt should be the right size of the map...

[dutch_designer]

Good idea, often created materials work best in a certain situation or lighting condition, it would be nice to store notes inside the .mxm in some kind of post-it format. Could be implemented like you have information about a band or song in mp3 files.

[Polyxo]

I like this idea too.