Supervisor.start_link/2 documentation incomplete?

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The init/1 callback is allowed to return {:ok, {:supervisor.sup_flags(), [:supervisor.child_spec()]}} | :ignore

[Erlang] Designing for Scalability with Erlang/OTP (O'Reilly) p.81:

If the startup fails but you do not want to affect other processes started by the same supervisor, return ignore.

p.178

The init/1 callback function normally returns the whole tuple comprising the restart tuple and a list of child specifications. But if it instead returns ignore, the supervisor terminates with reason normal.

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