diff --git a/pos_barcode_tare/static/src/js/pos_barcode_tare.js b/pos_barcode_tare/static/src/js/pos_barcode_tare.js
index 7203d4f2..9d238944 100644
--- a/pos_barcode_tare/static/src/js/pos_barcode_tare.js
+++ b/pos_barcode_tare/static/src/js/pos_barcode_tare.js
@@ -1,26 +1,34 @@
 odoo.define('pos_barcode_tare.screens', function (require) {
     "use strict";
-    var screens = require('point_of_sale.screens');
-    var gui = require('point_of_sale.gui');
+    var chrome = require('point_of_sale.chrome');
     var core = require('web.core');
-    var _t = core._t;
+    var devices = require('point_of_sale.devices');
+    var gui = require('point_of_sale.gui');
+    var models = require('point_of_sale.models');
+    var screens = require('point_of_sale.screens');
+    var QWeb = core.qweb;
 
+    // This configures read action for tare barcode. A tare barcode contains a
+    // fake product ID and the weight to be subtracted from the product in the
+    // latest order line.
     screens.ScreenWidget.include(
         {
             barcode_weight_action: function (code) {
                 var self = this;
                 var order = this.pos.get_order();
+                // Computes the paid weight
                 var last_order_line = order.get_last_orderline();
                 var total_weight = last_order_line.get_quantity();
                 var tare = code.value;
                 var paid_weight = total_weight - tare;
-
+                // Throws a warning popup if the price is negative
                 if (paid_weight <= 0) {
                     self.gui.show_popup('confirm',
                         {'title': _t('Negative weight'),
                             'body':  _t('The calculated weight is negative. ' +
                         'Did you scan the correct tare label?'),
                             confirm: function () {
+                                // Operator can choose to ignore the warning.
                                 last_order_line.set_quantity(paid_weight);
                             }});
                 } else {
@@ -28,6 +36,7 @@ odoo.define('pos_barcode_tare.screens', function (require) {
                 }
             },
 
+            // Setup the callback action for the "weight" barcodes.
             show: function () {
                 var self = this;
                 this._super();
@@ -36,14 +45,9 @@ odoo.define('pos_barcode_tare.screens', function (require) {
                     _.bind(self.barcode_weight_action, self));
             },
         });
-});
-
-odoo.define('tare-screen-button.button', function (require) {
-    "use strict";
-    var core = require('web.core');
-    var screens = require('point_of_sale.screens');
-    var gui = require('point_of_sale.gui');
 
+    // This create a new button on top of action widget. This button links to
+    // the barcode label printing screen defined below.
     var TareScreenButton = screens.ActionButtonWidget.extend({
         template: 'TareScreenButton',
 
@@ -57,18 +61,12 @@ odoo.define('tare-screen-button.button', function (require) {
         'name': 'tareScreenButton',
         'widget': TareScreenButton,
     });
-});
-
-odoo.define('tare-screen.screen', function (require) {
-    "use strict";
-    var chrome = require('point_of_sale.chrome');
-    var core = require('web.core');
-    var devices = require('point_of_sale.devices');
-    var gui = require('point_of_sale.gui');
-    var models = require('point_of_sale.models');
-    var screens = require('point_of_sale.screens');
-    var QWeb = core.qweb;
 
+    // This is a new screen that reads weight from the electronic scale and
+    // create a barcode label encoding the weight. The screen shows a preview
+    // of the label. The user is expected to check if the preview matches what's
+    // measured on the scale. The barcode image is generated by the report
+    // module.
     var TareScreenWidget = screens.ScreenWidget.extend({
         template: 'TareScreenWidget',
         next_screen: 'products',
@@ -79,13 +77,14 @@ odoo.define('tare-screen.screen', function (require) {
             this._super();
             var self = this;
             var queue = this.pos.proxy_queue;
-
+            // The pooling of the scale starts here.
             queue.schedule(function () {
                 return self.pos.proxy.scale_read().then(function (weight) {
                     self.set_weight(weight.weight);
                 });
             }, {duration:150, repeat: true});
-
+            // Shows a barcode whose weight might be zero, but this is preferred
+            // for UI/UX reasons.
             this.render_receipt();
             this.lock_screen(true);
         },
@@ -115,15 +114,26 @@ odoo.define('tare-screen.screen', function (require) {
             return checksum % 10;
         },
         barcode_data: function (weight) {
+            // We use EAN13 barcode, it looks like 21 00000 12345 x. First there
+            // is the prefix, here 21, that is used to decide which type of
+            // barcode we're dealing with. A weight barcode has then two groups
+            // of five digits. The first group encodes the product id. Here the
+            // product id is 00000. The second group encodes the weight in
+            // grams. Here the weight is 12.345kg. The last digit of the barcode
+            // is a checksum, here symbolized by x.
             var padding_size = 5;
             var default_weight_prefix_id = "21";
             var void_product_id = '0'.repeat(padding_size);
             var weight_in_gram = weight * 10e2;
+            // Weight has to be padded with zeros.
             var weight_with_padding = '0'.repeat(padding_size) + weight_in_gram;
             var padded_weight = weight_with_padding.substr(
                 weight_with_padding.length - padding_size);
+            // Builds the barcode data (ie. all but the checksum).
             var barcode_data = default_weight_prefix_id.concat(void_product_id,
                 padded_weight);
+            // Compute checksum and concat with barcode data to get the actual
+            // barcode.
             var checksum = this.ean13_checksum(barcode_data);
             var barcode = barcode_data.concat(checksum);
 
@@ -153,10 +163,8 @@ odoo.define('tare-screen.screen', function (require) {
             this.pos.get_order()._printed = true;
         },
         print: function () {
-            var self = this;
-
             // See comment in print function of ReceiptScreenWidget
-
+            var self = this;
             this.lock_screen(true);
 
             setTimeout(function () {