Dell users rose up mightily in June to tell the company that it was... shipping laptops that smelled like cat urine, according to the BBC. Four months later, Dell has finally figured out the the culprit: a palm rest.

The computer in question was the Dell Latitude 6430u, which many users claimed smelled like "cat pee.” Many seemed to think the smell was coming from inside the keyboard, so Dell suggested that those complaining give the keyboard a blast of compressed air. No dice; the smell of cat pee was strong in these laptops.

Dell announced late Tuesday that the palm rest turned out to be the source of the smell, and the company will start offering replacements to customers soon. But Dell did not name what, specifically, caused the smell.

The Smithsonian’s Smart News blog points out that it is not unheard of for urine, which has a high concentration of nitrogen, to be used as a “strengthening agent” in manufacturing. Smart News points to Autoevolution, which describes how BMW had a set of inline 4 cylinder blocks hardened in 1983 by having some people pee on them.

Is Dell having people pee on its laptop components to firm them up before installation? Almost certainly not. Does it use a pee-like, nitrogen-rich substance to accomplish the same end? Maybe. Just maybe.