Time.deltaTime and Time.fixedDeltaTime


Should we use Time.deltaTime ONLY in Update calls and Time.fixedDeltaTime ONLY in fixed update?

I was thinking it’s the case but stumbled upon a page in Unity’s manual (that I can’t find right now) that, if I’m not mistaken, in FixedUpdate, they’ve used Time.deltaTime, as opposed to what I’ve assumed above.