Add a longer explanation of what is being done.
MODIFY
src/util/index.js
src/util/index.js
@@ -747,7 +747,10 @@ var util = module.exports = {
/**
* Return the coordinate associated with the center of the perimeter formed
- * from a list of points.
+ * from a list of points. This averages all of the vertices in the perimeter
+ * weighted by the line length on either side of each point. Functionally,
+ * this is the same as the average of all the points of the lines of the
+ * perimeter.
*
* @param {geo.geoPosition[]} coor An array of coordinates.
* @returns {geo.geoPosition|undefined} The position for the center, or

Add a longer explanation of what is being done.