It is possible to automatically subscribe to the ActorKit API documentation directly in Xcode. To do so:

1. Launch Xcode.
2. Choose Help > Documentation.
3. From the Action menu in the lower left hand corner (the one with the Gear Icon), select "New Subscription..."
4. Paste the ActorKit Xcode Documentation Feed URL into the New Doc Subscription dialog
5. The documentation should appear in the Doc Sets pane. If it does not, try restarting Xcode.