User blog comment:HalliwellManorAkaDsc385/New Grimm Insight with David Giuntoli and Sasha Roiz/@comment-1966944-20120307003439

Giuntoli says he'd like to see Nick not just read the books but add to them. On the NBC site, if you click on Aunt Marie's trailer, then on the journal, you'll find some entries apprently made by Nick. So, I guess he is already writng about his own encounters and observations with the various Wesen.