Missing Custom Broker docs

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According to https://www.reddit.com/r/algotrading/comments/8fqz9w/i_built_an_opensource_algorithmic_trading_platform/ , a month ago trams said regarding custom broker documentation,

Now I have finally pushed the docs update!

, yet at https://devalpha.io/documentation#custom-brokers today all it says regarding creation of custom brokers is:

Defining a createBroker function
The createBroker function should return an object containing three functions.

type brokerCreator = (onFill) => ({

})

Is there product documentation somewhere other than the Git README.md's and https://devalpha.io/documentation ?