diff --git a/bestFitLine/README.md b/bestFitLine/README.md
index 1e1e24b..518d205 100644
--- a/bestFitLine/README.md
+++ b/bestFitLine/README.md
@@ -100,6 +100,15 @@ Add `extend: true` to your `bestFitLine` config, and the plugin will extend the
 trend line to fit the whole scope of data, even if your actual graph starts and 
 ends at some mid-point in data.
 
+### Using another valueField from dataProvidor
+
+Add `valueField: "theField"` to your `bestFitLine` config to change the field 
+used to calculate the trend line.
+Default is the current graph's valueField.
+
+Can be useful when using "openField" setting in graph (bar charts that doesn't
+start at 0).
+
 
 ## Examples
 
diff --git a/bestFitLine/bestFitLine.js b/bestFitLine/bestFitLine.js
index 6f2c084..4d909a9 100644
--- a/bestFitLine/bestFitLine.js
+++ b/bestFitLine/bestFitLine.js
@@ -41,18 +41,25 @@ AmCharts.bestFitLineProcess = function( chart, validateData ) {
 			lastCat,
 			firstDataCat,
 			lastDataCat;
+
 		if ( graph.bestFitLine !== undefined ) {
 			// found a graph
 			// generate values
 			var x = [],
 				y = [];
+
+			// set valueField setting
+			if ( graph.bestFitLine.valueField === undefined ) {
+				graph.bestFitLine.valueField = graph.valueField;
+			}
+
 			for ( var z = 0; z < chart.dataProvider.length; z++ ) {
 
 				// calculate category
 				var cat = getCategoryIndex( chart.dataProvider[ z ][ chart.categoryField ], z, chart );
 
 				// get value
-				var value = chart.dataProvider[ z ][ graph.valueField ] ;
+				var value = chart.dataProvider[ z ][ graph.bestFitLine.valueField ] ;
 
 				if ( value != null ) {
 					value = +value;
@@ -123,7 +130,7 @@ AmCharts.bestFitLineProcess = function( chart, validateData ) {
 
 			// create a graph for the best fit line
 			var trendGraph = graph.bestFitLine;
-			trendGraph.valueField = graph.valueField + "FitLine";
+			trendGraph.valueField = graph.bestFitLine.valueField + "FitLine";
 			if ( trendGraph.trendInited !== true )
 				chart.graphs.push( trendGraph );
 			trendGraph.trendInited = true;