It’s update day for Apple as we’ve seen iOS 9.1, OS X 10.11.1 and now watchOS 2.0.1 for Apple Watch users. The update is available over-the-air. Just launch the Apple Watch app and go to General > Software Update and you should see it.
Apple says this update includes fixes to battery life, update installs, iOS calendar syncing, Digital Touch sending to email addresses instead of phone numbers, fixed an issue with Live Photos as watch faces and also a sensor issue related to Siri and measuring heart rate.
Let us know how your install goes!