So, I double click on it and you see it puts in the actual formula name for me and that start parentheses [(] to get it going, and then here it gives me a screen tip which tells me what values I need to actually calculate this formula and here, um, it says mandatory I have to have at least one value or at least one reference to count and that optionally I can add additional values to it, so any, um, information that's provided in a screen tip like this, that has the square brackets around it means that it's optional, and the 