If you’re worried about potential spying, then you may have resorted to covering up your laptop’s web camera. It’s a tip even the FBI recommends. 

Just try not to do it on a MacBook, so says Apple. The company has created an official support document about the dangers of closing the laptop when the web camera has been covered up. Apparently, doing so can break down the display. 

“If you close your Mac notebook with a camera cover installed, you might damage your display because the clearance between the display and keyboard is designed to very tight tolerances,” reads the support document, which was first spotted by MacRumors. 

“Covering the built-in camera might also interfere with the ambient light sensor and prevent features like automatic brightness and True Tone from working,” the page goes on to say. 

The guidance was published on July 2 and applies to anyone who owns a MacBook, MacBook Air and MacBook Pro. 

So what’s the recommended alternative? Ideally, don't buy a privacy cover. Apple says customers should instead rely on the green indicator light next to the camera to tell when it’s on or not. “The camera is engineered so that it can’t activate without the camera indicator light also turning on. This is how you can tell if your camera is on,” the page says. 

In other words, Apple wants you to trust that no one will be able to circumvent its protections, even as past security research has uncovered macOS malware capable of taking screen captures. For instance, the “Fruitfly” malware circulated for years with the apparent ability to secretly hijack a Mac's web camera.

Still, if you really need to place a covering, the company advises you make it no thicker than a piece of paper ,at 0.1mm. “Avoid using a camera cover that leaves adhesive residue,” Apple adds, which is probably a nod to scotch tape. The other solution is to place the covering, but only when your laptop is open.

MacRumors points out that some MacBook owners have, indeed, damaged their laptops after placing a covering over the web camera. So be careful; it’s probably best to avoid using a covering that’s made out of hard plastic.

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