diff --git a/src/html/js/entries.js b/src/html/js/entries.js
index 6901f8c..02942be 100644
--- a/src/html/js/entries.js
+++ b/src/html/js/entries.js
@@ -11,6 +11,7 @@ function entry(data){
     this.category=ko.observable(ko.utils.unwrapObservable(data.category));
 }
 
+// Util function to show a message in message placeholder.
 function message(alertType, title, message) {
   $(".alert").alert('close');
   $("#message-placeholder").append('<div class="alert alert-' + alertType + '"><button type="button" class="close" data-dismiss="alert">&times;</button><h4>' + title + '</h4><strong>' + message + '</strong></div>');
@@ -19,30 +20,33 @@ function message(alertType, title, message) {
 var ListViewModel = function() {
     var self = this;
 
+    // Account store and selection
     self.account = ko.observable();
     self.accounts = ko.observableArray([]);
 
-    self.entries = ko.observableArray([]);
-
+    // Month store and selection
     self.months = ko.observableArray();
     self.month = ko.observable();
 
+    // Entry store and selection
+    self.entries = ko.observableArray([]);
     self.selectedItem = ko.observable();
+    // Placeholder for saved value to cancel entry edition
     self.savedItem = ko.observable();
+    // Placeholder for entry to remove to be available in modal function "yes" click callback
     self.itemToRemove = ko.observable();
-    self.chart = null;
 
+    // Returns the data for the categories by summing values with same category
     self.expenseCategoriesChart = ko.computed(function() {
       var entries=ko.utils.unwrapObservable(self.entries);
 
-      var chartValues = [];
+      // First pass: get sum values for each category.
       var chartValuesTmp = {};
-
       $.each(entries, function(index, entry) {
         var category = entry.category();
         var value = entry.value() ? Number(entry.value()) : null;
 
-        if(category && value) {
+        if(category && value && value < 0.0) {
           var oldValue = 0.0;
 
           if(chartValuesTmp[category]) {
@@ -53,6 +57,8 @@ var ListViewModel = function() {
         }
       });
  
+      // Second pass: transform to an array readable by jqplot.
+      var chartValues = [];
       $.each(chartValuesTmp, function(key, value) {
         chartValues.push([key, value]);
       });
@@ -60,12 +66,13 @@ var ListViewModel = function() {
       return chartValues;
     });
 
+    // Return the data for the sold chart.
     self.entriesChart = ko.computed(function() {
+      // We assume that entries are sorted by value date descending.
       var entries = ko.utils.unwrapObservable(self.entries).slice().reverse();
 
-      var chartValues = [];
+      // First pass: get open, high, low and close values for each day.
       var chartValuesTmp = {};
-
       $.each(entries, function(index, entry) {
         //var date = entry.value_date() ? entry.value_date().toString() : null;
         var date = entry.value_date();
@@ -100,24 +107,22 @@ var ListViewModel = function() {
         }
       });
 
+      // Second pass: transform to an array readable by jqplot OHLC renderer.
+      var chartValues = [];
       $.each(chartValuesTmp, function(key, value) {
-        var ohlc = [key, value['open'], value['high'], value['low'], value['close']];
-        chartValues.push(ohlc);
-      });
-
-      chartValues.sort(function(a, b){
-        var aDate = Date.parse(a[0]);
-        var bDate = Date.parse(b[0]);
-
-        return aDate < bDate ? -1 : 1;
+        chartValues.push([key, value['open'], value['high'], value['low'], value['close']]);
       });
 
       return chartValues;
     }, self);
 
+    // Function to load entries from server for a specific account and month.
     self.loadEntries = function(account, month) {
       $.post("api/entry.php", {action: "get_entries", account: account.id, year: month.year, month: month.month}, function(data) {
+          // Clean up current entries.
           self.entries.removeAll();
+
+          // Clean up selected entry.
           self.selectedItem(null);
 
           var entries = [];