A screenshot of the update prompt was shared on Reddit by ironkid65. From it, we can see the update's version number, and that it'll take up 260MB of space. We haven't tested the update, so we can't confirm everything that comes with it, but the update text says that the stability of the camera and Face Unlock have been improved.
Meanwhile, the Galaxy S9 Plus comes with dual-rear cameras, the only Samsung phone to include this feature besides the Galaxy Note 8. However, CNET editors noticed that the camera modes too easily switched from auto to selfie to AR Emoji, for example, making the act of photography frustrating -- hopefully this is what the update addresses.
Samsung did not immediately respond to a request for comment.
Watch this: We test the Galaxy S9 in the real world
The other part of the update is intended for Face Unlock, which is Samsung's biometric method that uses facial recognition to unlock your phone. Unlike the iPhone X'sFace ID feature, Face Unlock is not secure enough for mobile payments.
If you're still waiting to purchase or receive your Galaxy S9 or Galaxy S9 Plus, be sure to check for software updates when you get your hands on it. There's a chance the update may be waiting for you or maybe your device will ship with the latest version.