Posted on October 18 2017 by Jarrod Raine
Nintendo has recently released a software update not for the Switch itself but rather for the Joy-Con controllers. To update your Joy-Cons, visit System Settings and then head to the “Controllers and Sensors” tab. Then, click on “Update Controllers” and the Joy-Cons will be updated in just a few seconds! While it is currently unknown what the update adds, there is no doubt that Nintendo will reveal that information in the future.
Source: Nintendo Everthing