Renewing the Permesso di Soggiorno, Part 2

I went to the questura today, and after waiting only 3 hours, was informed that the letter of enrollment from my school needed to be stamped by the Italian embassy/consulate in the US. I think it would be nice if that information were written down somewhere, like in the list of documents you need in order to renew your permesso di soggiorno. Either that, or someone (consulate, questura, the Italian government that wrote the list) doesn't know what they're talking about.

(This is a continuation of these three posts.)