Wonder Woman is “the latest Marvel superhero adventure” according to the first page of the Calgary Sun’s entertainment section.

Except that it isn’t. For her entire 75-plus year history, Wonder Woman has been owned by DC Comics and has existed in the DC universe. The upcoming Wonder Woman movie will be a part of the DC Extended Universe, not the Marvel Cinematic Universe.

This likely seems obvious to fans familiar with the superhero landscape but may be less obvious to the casual, mainstream observer. One reader felt obligated to respond to the error and sent a letter to the paper’s editor reading, “I was excited to see an article on the upcoming movie Wonder Woman but was shocked to see such a big error, in large print, on the cover of the ENT section of Sunday’s newspaper. Wonder Woman is a DC universe character, NOT a Marvel character. Thankfully, the article had it right but that’s a pretty big oops, especially for diehard fans!”

The paper’s response reads, “Sorry, we hire mere mortals for newspapering and sometimes they do human things, like screw up.” Mistakes happen, but this seems like a pretty significant gaff, especially since the body of the article had it correct and a simple Google search would have been all the fact-checking needed to get it right in the headline.

omg... this is REAL! ? The editor of the newspaper has responded as well: https://t.co/3miVrvaJkg pic.twitter.com/iiYBkniOAS — Batman-News.com (@BatmanNewsCom) April 29, 2017