"Extra" field in item info

I notice that most (all?) of the types of document one can cite/manage in Zotero have a field called "extra" in the template. Can I use this for a system of private codes, or will some citations come with an entry of some kind for this field? And is this field in fact universal?

Thanks, and I apologize if the answer should be obvious, I just didn't want to put my system in place only to discover problems down the road.
  • I actually mapped this using the javascript to note and created a special report CSL output style to create an easily scannable list of resources for inclusion and sharing printed copies among different teams. I had to change the mapping to get it to show up though...
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