Where to put comments in an if-then-else construct? [closed]

For me, a comment above the IF explains the IF statement itself. For example, if the condition being tested is particularly complex.

A comment in the block below the IF or ELSE describes what’s going once the condition has been evaluated and a choice made.

So like this:

//Is this a favoured customer and do we have a promotion?
if customer.special() and monthly.hasOffer() {
  //Add discount
  invoice.addDiscount();
} 
else {
  //Add note about favoured customer scheme
  invoice.addNotes(JOIN_OUR_DISCOUNT_SCHEME);
}