There's now more evidence that suggests Apple is working on a VR headset.

The company's application for a head-mounted display that works with a "portable electronic device" (or the iPhone) was published on Thursday. It appears to be a slightly updated version of a patent granted last February. Apple filed other patents related to VR headsets in 2008, 2009, and 2012.

Here's what the patent looks like:

Screen Shot 2016 03 24 at 1.34.22 PM This drawing shows a phone being inserted into the headset. USPTO

Screen Shot 2016 03 24 at 1.34.10 PM Apple also imagines the headset having a touch-sensitive remote. USPTO

While Apple patents all kinds of ideas that never make it to market, this headset patent is particularly interesting given recent reports that Apple has hundreds of engineers working on VR. The headset design looks very similar to existing VR headsets like the Oculus Rift and Samsung Gear VR.

While Apple doesn't explicitly mention virtual reality in the patent application, it does mention use cases that strongly hint towards VR. For example, the headset could include sensors like an accelerometer to "detect the user's head movements."

The full patent application from Apple is available to read on the U.S. Patent and Trademark Office's website.