Dual citizen, paperwork required?

[Jamarns]

So I am getting all my paperwork together for my application. I am a dual citizen of Australia and Switzerland, I have all my information for my Australian citizenship, which is where I was born. I do not however have any paperwork proving my citizenship in Switzerland, the only thing I would have is a long expired passport that my mother has back home (from when I was a child) do I need to provide paperwork confirming my citizenship in Switzerland?