::Uh-oh Noleander.  You're an uncooperative tauist now too, for asking that a reference be provided.  Neither of the two references on Eagle's page mention it.  While I don't see where Tkuvho's reported consensus for keeping it in the Pi article formed, I don't object to having it.  But more rabid tauists like Noleander tend to ask that the work of finding a source be done by the person adding the sentence. ;-)