If you use any of the core blocks that comes with Concrete5 you get a little help icon at the block header.
From there you can get additional information and also a link to help documents.

Is there no way to add this to your own build blocks?

I manage to locate where the help data is coming from and it looks like it is: concrete/helpers/concrete/interface/help.php

And its a class called ConcreteInterfaceHelpHelper.

Any idea how to tweak this into working for your own blocks without destroying anything?