diff --git a/examples/timeline/08_edit_items.html b/examples/timeline/08_edit_items.html
index a8c1bd88..b41726b7 100644
--- a/examples/timeline/08_edit_items.html
+++ b/examples/timeline/08_edit_items.html
@@ -18,6 +18,7 @@
   <div id="log"></div>
 
   <script type="text/javascript">
+    // note that months are zero-based in the JavaScript Date object, so month 3 is April
     var items = new vis.DataSet([
       {id: 1, content: 'item 1', start: new Date(2013, 3, 20)},
       {id: 2, content: 'item 2', start: new Date(2013, 3, 14)},
diff --git a/examples/timeline/09_order_groups.html b/examples/timeline/09_order_groups.html
index ef588668..7b1bd16e 100644
--- a/examples/timeline/09_order_groups.html
+++ b/examples/timeline/09_order_groups.html
@@ -33,6 +33,7 @@
   ]);
 
   // create a dataset with items
+  // note that months are zero-based in the JavaScript Date object, so month 3 is April
   var items = new vis.DataSet([
     {id: 0, group: 0, content: 'item 0', start: new Date(2014, 3, 17), end: new Date(2014, 3, 21)},
     {id: 1, group: 0, content: 'item 1', start: new Date(2014, 3, 19), end: new Date(2014, 3, 20)},
diff --git a/examples/timeline/10_limit_move_and_zoom.html b/examples/timeline/10_limit_move_and_zoom.html
index a2b8504e..37006aa5 100644
--- a/examples/timeline/10_limit_move_and_zoom.html
+++ b/examples/timeline/10_limit_move_and_zoom.html
@@ -27,6 +27,7 @@
 
 <script>
   // create some items
+  // note that months are zero-based in the JavaScript Date object, so month 4 is May
   var items = [
     {'start': new Date(2012, 4, 25), 'content': 'First'},
     {'start': new Date(2012, 4, 26), 'content': 'Last'}
diff --git a/examples/timeline/11_points.html b/examples/timeline/11_points.html
index 901459f2..bfc4797f 100755
--- a/examples/timeline/11_points.html
+++ b/examples/timeline/11_points.html
@@ -22,6 +22,7 @@
 <script type="text/javascript">
   var container = document.getElementById('visualization');
 
+  // note that months are zero-based in the JavaScript Date object
   var items = [
     {start: new Date(1939,8,1),  content: 'German Invasion of Poland'},
     {start: new Date(1940,4,10), content: 'Battle of France and the Low Countries'},
diff --git a/examples/timeline/12_custom_styling.html b/examples/timeline/12_custom_styling.html
index 410bef45..ed0fdf35 100644
--- a/examples/timeline/12_custom_styling.html
+++ b/examples/timeline/12_custom_styling.html
@@ -65,6 +65,8 @@
 
 <script type="text/javascript">
   var container = document.getElementById('visualization');
+
+  // note that months are zero-based in the JavaScript Date object
   var items = [
     {start: new Date(2010,7,23), content: '<div>Conversation</div><img src="img/community-users-icon.png" style="width:32px; height:32px;">'},
     {start: new Date(2010,7,23,23,0,0), content: '<div>Mail from boss</div><img src="img/mail-icon.png" style="width:32px; height:32px;">'},
@@ -75,6 +77,7 @@
     {start: new Date(2010,7,31), end: new Date(2010,8,3), content: 'Traject B'},
     {start: new Date(2010,8,4,12,0,0), content: '<div>Report</div><img src="img/attachment-icon.png" style="width:32px; height:32px;">'}
   ];
+
   var options = {
     editable: true,
     margin: {
@@ -82,6 +85,7 @@
       axis: 40
     }
   };
+
   var timeline = new vis.Timeline(container, items, options);
 </script>
 </body>
diff --git a/examples/timeline/15_item_class_names.html b/examples/timeline/15_item_class_names.html
index 43dd348f..903f9d96 100755
--- a/examples/timeline/15_item_class_names.html
+++ b/examples/timeline/15_item_class_names.html
@@ -73,6 +73,7 @@
 
 <script type="text/javascript">
   // create data
+  // note that months are zero-based in the JavaScript Date object
   var data = [
     {
       'start': new Date(2012,7,19),