Ah yes, then we do have a bit of a Rule
xkcd: 154
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IT IS LITERALLY A CRIME TO NOT CREDIT XKCD AND YOU NEED TO CREDIT THE SPECIFIC PAGE(?)
xkcd 154 Never really thought about someone not recognizing it, but I'll update desc and try to remember in the future
under copyright law, you are required to credit it. this is due to the creative commons license at the bottom of the page. compare this to normal copyright law, where you are sent to jail if you even think about it