# Add comments to Excel formulae

Are you regularly working with long Excel formulae? I certainly am: Many of mine will run into multiple lines such as the example below:

`=IFERROR(SUM((IF([@Treatment]="Control", "NA", MAX(IF((([@Row]=TEXT(DroughtSpotter[Row],0))*(([@Column]=TEXT(DroughtSpotter[Column],0)))*(DATEVALUE(DroughtSpotter[Time_Corrected])=(MIN(DATEVALUE(DroughtSpotter[Time_Corrected])+1)))*(TIMEVALUE(DroughtSpotter[Time_Corrected])>0.5)*(TIMEVALUE(DroughtSpotter[Time_Corrected])<0.75)),DroughtSpotter[Weight_g]))))-(IF([@Treatment]="Control", "NA", MIN(IF((([@Row]=TEXT(DroughtSpotter[Row],0))*(([@Column]=TEXT(DroughtSpotter[Column],0)))*(DATEVALUE(DroughtSpotter[Time_Corrected])=(MIN(DATEVALUE(DroughtSpotter[Time_Corrected])+1)))*(TIMEVALUE(DroughtSpotter[Time_Corrected])>0.5)*(TIMEVALUE(DroughtSpotter[Time_Corrected])<0.75)),DroughtSpotter[Weight_g]))))), "NA")`

When formulae become this long, it becomes very difficult to keep track of the various components of each equation.

Thankfully there is a very simple solution to this problem.

## The N function

In Microsoft Excel, the N function returns a value converted to a number. Conveniently, the function can be 'hacked' into a comment by including text inside quotation marks within the function:

`=N("Insert Comment Here")`

This will return a value of 0, which for most functions is not a problem. To implement the function, simply add it to your existing equation as per the example below:

`=SUM(IF((([@Row]=TEXT(DroughtSpotter[Row],0))*(([@Column]=TEXT(DroughtSpotter[Column],0)))),DroughtSpotter[Lighting])+N("Insert Comment Here"))`

Now you can add useful comments throughout your long Excel formulae to keep track of each component without interfering with the equation itself.

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