This might be a stupid question, but it's been in the back of my head for a while and I can't find a decent answer anywhere else.

I have a teacher who says we should explicitly list each parameter with a description, even if there's only one. This leads to a lot of repetition:

double MyFunction(const int MyParam);
// Function: MyFunction
// Summary: Does stuff with MyParam.
// Input: int MyParam - The number to do stuff with.
// Output: MyParam with stuff done to it.

When writing in-code documentation, how detailed are you?