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And to answer your question: no, you don't need headers for categories. Its not written down but its common practice. -Reconsider! 09:54, 17 December 2009 (UTC)[reply]
Which makes sense, given that the categories actually don't look like article content, they're a separate box below the article in the most common layout. It's confusing to see a header with no text below it. --Alvestrand (talk) 05:40, 18 December 2009 (UTC)[reply]
