How do you run rosbag2 in ROS2 Crystal?

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I'm running ROS2 Crystal on Ubuntu 18.04. I've installed the ros-crystal-rosbag2 package, but am not sure how to run it. From the Github readme it looks like this should add a verb to the ROS2 command, but when I run:

ros2 bag record -a

I get the following error:

usage: ros2 [-h] Call `ros2 <command> -h` for more detailed usage. ...
ros2: error: argument Call `ros2 <command> -h` for more detailed usage.: invalid choice: 'bag' (choose from 'daemon', 'extension_points', 'extensions', 'launch', 'lifecycle', 'msg', 'multicast', 'node', 'param', 'pkg', 'run', 'service', 'srv', 'topic')

How do I run rosbag2 in Crystal?

Thanks,

David