Board Thread:Shingeki no Kyojin Wiki/@comment-5774380-20150329004214/@comment-5774380-20150329020053

If the anime is not considered canon, then no matter what happens on it, it shouldn't be included in the articles. As I said in the other thread, this treatment has just brought countless discussions about what to include and what not (like Hange's gender); and at the end, it's pointless, because the anime is made by third parties and not by Isayama, so if something happens on it and not in the manga, was not for Isayama's decision, and therefore never ocurred in the timeline of the series.

The One Piece Wiki explains in more detail why they never consider the events of the anime as canon under any circumstance.

The only exceptions should be pictures from the anime, and only when they are mere equivalents of scenes found in the manga with better quality than them.