Yes, there is a little yellow "be safe" sticker which is required. To be honest, mine is worn off, and I haven't taken time to pick up a replacement, which, I think, should be available at any permit vendor. Hopefully, this would be considered a minor infraction, since these aren't available online, but to be safe, you might want to try and pick one up. Walmarts are normally a license vendor, as well as many smaller establishments.
Good luck. I killed a nice bird at 9:01 yesterday morning.