Problem setting units of measurements when creating the doc.

So I'm assuming this is it. 

 app.scriptPreferences.measurementUnit = MeasurementUnits.INCHES;

But I just don't know where to put it.

function createDocument(documentWidth, documentHeight, bleed, rectangleWidth, rectangleHeight, textFrameGeometricBounds, pointSize, leadingSize) {
  // Create a new document with the specified width and height and bleed
  var doc = app.documents.add({
    documentPreferences: {
      pageWidth: documentWidth,
      pageHeight: documentHeight,
      documentBleedTopOffset: bleed,
      documentBleedUniformSize: true,
      facingPages: false
    }
  });