Less than a week after Samsung launched its Galaxy Note 5 in the US, a design flaw has just been discovered with its S Pen.

Samsung warns its users not to insert the S Pen the wrong direction.

Unlike previous Galaxy Note models, the latest version comes with a redesigned stylus pen with symmetrical ends. Hopefully not, because you might not have known to be extra careful about reinserting your S-Pen back into the device the right way.  When you do, you’ll nearly certainly break the stylus detection mechanism. In the earlier variants of the Note, when someone tried to insert the stylus from the wrong side, it would experience obstruction and the user would instantly realize that something is wrong. Any sort of damage in the S Pen can literally cripple the phone of its essential features.

While we don’t discount the possibility of a child using your phone and putting it in the wrong way, or something happens that you accidentally do so, those incidents are few and far between.

Samsung said users should follow the instruction manual. The manual for the Samsung Galaxy Note 5 has specific guidelines for placing the S-pen in the device. Still, Samsung may want to get out in front of this a little more, beyond just telling people to follow the instruction manual. Detractors have other ideas, saying Samsung should have made this device fool-proof. But the Galaxy Note 5 doesn’t actually ship with a user guide in the box or in the software.