It’s not extensive however it is vital for the Apple Watch to function smoothly. Apple release watchOS 3.1 to get rid of some Bugs.

Here’s the full list of changes for watchOS 3.1:

• New option to replay bubble and full screen effects in Messages.
• Messages effect can play with Reduce Motion enabled.
• Fixes an issue that could pause the notification for Timer complete to be delivered twice. Resolves an issue that could prevent Apple Watch Series 2 from fully charging.
• Resoles an issue where Activity rings may disappear from the watch face.
• Fixes an issue that prevented Force Touch options from appearing in some-third party apps.