normal engine noise ?

Forgive me for asking these questions about noises, etc but I am new to porsches and just like to get peoples views.
On start up, for about a second , I get a noise that resembles a chain being drawn across a wooden box, I seem to have read somewhere about this noise and it was explained that it was the chains going across the tensioners/guides prior to them being pressurized ( all happens very quick)
Is this a fair assumption to make. Thanks Alan