diff --git a/src/app/panels/histogram/editor.html b/src/app/panels/histogram/editor.html
index 08bfcc2cf..d5d5447be 100755
--- a/src/app/panels/histogram/editor.html
+++ b/src/app/panels/histogram/editor.html
@@ -24,6 +24,10 @@
       <label class="small">Group By Field <tip>This field must be a single value field. Leave blank if you do not want to group the result.</tip></label>
       <input ng-change="set_refresh(true)" placeholder="Optional" bs-typeahead="fields.list" type="text" class="input-small" ng-model="panel.group_field">
     </div>
+    <div class="span3">
+      <label class="small">SUM the group's values <tip>The point value (Y) is the sum of value field in the group</tip></label>
+      <input type="checkbox" ng-model="panel.sum_value" ng-checked="panel.sum_value">
+    </div>
     <!-- <div class="span3">
       <label class="small">Max Rows/Group <tip>Specify the number of results to return for each group.</tip></label>
       <input ng-change="set_refresh(true)" placeholder="10" type="number" class="input-small" ng-model="panel.group_limit">
diff --git a/src/app/panels/histogram/module.js b/src/app/panels/histogram/module.js
index c2889800b..624c57ad4 100755
--- a/src/app/panels/histogram/module.js
+++ b/src/app/panels/histogram/module.js
@@ -82,6 +82,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
       max_rows    : 100000,  // maximum number of rows returned from Solr (also use this for group.limit to simplify UI setting)
       value_field : null,
       group_field : null,
+      sum_value   : false,
       auto_int    : true,
       resolution  : 100,
       interval    : '5m',
@@ -199,7 +200,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
 
       var request = $scope.sjs.Request().indices(dashboard.indices[segment]);
       $scope.panel.queries.ids = querySrv.idsByMode($scope.panel.queries);
-
+      
 
       $scope.panel.queries.query = "";
       // Build the query
@@ -210,6 +211,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
         );
 
         var facet = $scope.sjs.DateHistogramFacet(id);
+
         if($scope.panel.mode === 'count') {
           facet = facet.field(filterSrv.getTimeField());
         } else {
@@ -221,7 +223,6 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
         }
         facet = facet.interval(_interval).facetFilter($scope.sjs.QueryFilter(query));
         request = request.facet(facet).size(0);
-
       });
 
       // Populate the inspector panel
@@ -347,6 +348,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
 
                   for (var j = 0; j < groups.length; j++) { // jshint ignore: line
                     var docs = groups[j].doclist.docs;
+                    var numFound = groups[j].doclist.numFound;
                     var group_time_series = new timeSeries.ZeroFilled({
                       interval: _interval,
                       start_date: _range && _range.from,
@@ -359,11 +361,17 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
                     for (var k = 0; k < docs.length; k++) {
                       entry_time = new Date(docs[k][time_field]).getTime(); // convert to millisec
                       entry_value = docs[k][$scope.panel.value_field];
-                      group_time_series.addValue(entry_time, entry_value);
+                      if($scope.panel.sum_value) {
+                        group_time_series.sumValue(entry_time, entry_value);
+                      }else {
+                        group_time_series.addValue(entry_time, entry_value);
+                      }
+
                       hits += 1;
                       $scope.hits += 1;
                     }
 
+
                     $scope.data[j] = {
                       // info: querySrv.list[id],
                       // Need to define chart info here according to the results, cannot use querySrv.list[id]
@@ -376,6 +384,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
                       hits: hits
                     };
                   }
+
                 } else { // Group By Field is not specified
                   entries = results[index].response.docs;
                   for (var j = 0; j < entries.length; j++) { // jshint ignore: line
@@ -598,7 +607,7 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
             scope.plot = $.plot(elem, scope.data, options);
           } catch(e) {
             // TODO: Need to fix bug => "Invalid dimensions for plot, width = 0, height = 200"
-            // console.log(e);
+            console.log(e);
           }
         }
 
@@ -634,12 +643,80 @@ function (angular, app, $, _, kbn, moment, timeSeries) {
             } else {
               value = item.datapoint[1];
             }
+
+            var lnLastValue = value;
+
+            var lbPositiveValue = (lnLastValue>0);
+
+            var lsItemTT = group + dashboard.numberWithCommas(value) + " @ " + (scope.panel.timezone === 'utc'? moment.utc(item.datapoint[0]).format('MM/DD HH:mm:ss') : moment(item.datapoint[0]).format('MM/DD HH:mm:ss'));
+
+            var hoverSeries = item.series;
+            var x = item.datapoint[0],
+                y = item.datapoint[1];
+
+            var lsTT = lsItemTT;
+            var allSeries = scope.plot.getData();
+            var posSerie = -1;
+            for (var i= allSeries.length - 1 ; i>=0; i--) {
+
+              //if stack stop at the first positive value
+              if (scope.panel.stack && lbPositiveValue){
+                break;
+              }
+
+              var s = allSeries[i];
+              i = parseInt(i);
+
+
+              if (s == hoverSeries ) {
+                posSerie = i;
+              }
+
+              //not consider serie "upper" the hover serie
+              if (  i >= posSerie ){
+                continue;
+              }
+
+              //search in current serie a point with de same position.
+              for(var j= 0; j< s.data.length;j++){
+                var p = s.data[j];
+                if (p[0] == x ){
+
+                  if (scope.panel.stack && scope.panel.tooltip.value_type === 'individual' && !isNaN(p[2]))  {
+                    value = p[1] - p[2];
+                  } else {
+                    value = p[1];
+                  }
+
+                  lbPositiveValue = value > 0;
+
+                  if (! scope.panel.stack && value != lnLastValue){
+                    break;
+                  }
+
+                  posSerie = i;
+                  lnLastValue = value;
+
+
+                  if (s.info.alias || scope.panel.tooltip.query_as_alias) {
+                    group = '<small style="font-size:0.9em;">' +
+                        '<i class="icon-circle" style="color:'+s.color+';"></i>' + ' ' +
+                        (s.info.alias || s.info.query)+
+                        '</small><br>';
+                  } else {
+                    group = kbn.query_color_dot(s.color, 15) + ' ';
+                  }
+
+                  lsItemTT = group + dashboard.numberWithCommas(value) + " @ " + (scope.panel.timezone === 'utc'? moment.utc(p[0]).format('MM/DD HH:mm:ss') : moment(p[0]).format('MM/DD HH:mm:ss'));
+                  lsTT = lsTT +"</br>"+ lsItemTT;
+                  break;
+                }
+              }
+            }
+
+
             $tooltip
-              .html(
-                group + dashboard.numberWithCommas(value) + " @ " + (scope.panel.timezone === 'utc'? moment.utc(item.datapoint[0]).format('MM/DD HH:mm:ss') : moment(item.datapoint[0]).format('MM/DD HH:mm:ss'))
-                // group + dashboard.numberWithCommas(value) + " @ " + moment(item.datapoint[0]).format('MM/DD HH:mm:ss')
-                // group + dashboard.numberWithCommas(value) + " @ " + moment(item.datapoint[0])
-              )
+              .html( lsTT )
               .place_tt(pos.pageX, pos.pageY);
           } else {
             $tooltip.detach();
diff --git a/src/app/panels/histogram/timeSeries.js b/src/app/panels/histogram/timeSeries.js
index 96054fa7d..e8f4a9420 100755
--- a/src/app/panels/histogram/timeSeries.js
+++ b/src/app/panels/histogram/timeSeries.js
@@ -68,6 +68,30 @@ function (_, Interval) {
     this._cached_times = null;
   };
 
+  /**
+   * Add a row and sum the value
+   * @param {int}  time  The time for the value, in
+   * @param {any}  value The value at this time
+   */
+  ts.ZeroFilled.prototype.sumValue = function (time, value) {
+    if (time instanceof Date) {
+      time = getDatesTime(time);
+    } else {
+      time = base10Int(time);
+    }
+    if (!isNaN(time)) {
+
+      var curValue = 0;
+      if (!isNaN(this._data[time])){
+          curValue = this._data[time];
+      };
+
+
+      this._data[time] = curValue + (_.isUndefined(value) ? 0 : value);
+    }
+    this._cached_times = null;
+  };
+
   /**
    * Get an array of the times that have been explicitly set in the series
    * @param  {array} include (optional) list of timestamps to include in the response