Bug in Apple Notes

Playing around in the local Apple Store this morning I found a buglet in the Notes app on OS X. Apologies if this has been mentioned before.

In Notes, Command-B toggles Bold on and off, Command-U toggles underline on and off and Command-I toggles Italics... well it toggles it on, but apparently not off again!

I tested it on Macbook, rMBP and Mac Mini so I guess it is a Yosemite bug. How does one report such a thing to Apple?