http://www.businessinsider.com/wikipedia-comprised-of-bryan-henderson-wikignome-2015-2 Also "Based around" is being exterminated. "Comprised of" is in common usage, however, and most people don't realise it's wrong. But Bryan Henderson is on a mission to change that. Backchannel reports that the 51-year-old software engineer is an extraordinarily active contributor to Wikipedia, making 47,000 edits over the past decade — almost exclusively to correct other editors' incorrect usage of "comprised of." "Henderson told Backchannel that when he made his first edits "and nobody came back and scolded me for it," he was hooked. He initially identified 15,000 incorrect uses of the term using Google and began methodically working through them. There was a backlash from editors, which "came as quite a surprise," as other Wikipedia users were irked to be corrected on a mistake they didn't realise they had made. "But Henderson persevered, and he wrote scripts that would hunt down uses of the term and flag them for him to correct. He has now corrected every single misuse of "comprised of" on English-language Wikipedia — no mean feat, considering the site has more than 4.7 million articles. Nonetheless, between 70 and 80 new ones appear on the site each week, according to Backchannel, and Henderson spends about an hour every Sunday night hunting them down. "He has even inspired his brother to take up a similar cause. Robin Henderson now keeps an eye out for the incorrect term "based around" (it should be "based on") on Wikipedia — though he says he doesn't have the same "search and destroy" attitude as Bryan".