Thanks. Bon Appetite did make a couple of revisions. My original recipe calls for using mushroom broth (which I buy at Whole Foods). I guess they believed that vegetable broth is more available and an acceptable substitution. Also, I prefer using Carnaroli Rice to Arborio. Yet, I'm sure Arborio works just fine.
If you have some dried porcini mushrooms, try and make some porcini powder. Add this at the last minute along with the cheese. Adds great flavor but is definitely not necessary. I find porcini powder at an Italian grocer in Santa Monica. It's a fantastic condiment, to be used very sparingly.