diff --git a/htdocs/js/samples/zoom2.js b/htdocs/js/samples/zoom2.js
index 717364f..aa64fec 100644
--- a/htdocs/js/samples/zoom2.js
+++ b/htdocs/js/samples/zoom2.js
@@ -1,8 +1,4 @@
-///<reference path="http://localhost/cockpit/js/playground/utils.js"></script>
-
-
-
-var chart;
+var chart;
 function refresh() {
     if (suspendRefresh)
         return;
@@ -26,43 +22,20 @@ function main() {
     var xColumn = Array.generateNumbers(0, max);
     var options = {
         bindto: "#divChart",
-        //transition: { duration: 0 },
         data: {
             columns: [
                 ["Value"].concat(column),
                 ["x"].concat(xColumn),
-            ],//column
+            ],
             type: "line",
             x: "x"
         },
         zoom2: { 
             enabled: true, 
-            //reducers: { 
-            //    col: "t=>Math.round(t.avg())".toLambda(), 
-            //    xColumns: "t=>t[0]".toLambda() 
-            //} 
         }
     };
     chart = c3ext.generate(options);
 
-
-    //var deltaY = 0;
-    //var leftRatio = 0;
-    //var el = $("#divChart");
-    //var timer = new Timer(doZoom);
-    //el.mousewheel(function (e) {
-    //    deltaY += e.deltaY;
-    //    leftRatio = (e.offsetX - 70) / (e.currentTarget.offsetWidth - 70);
-    //    console.log({ "e.offsetX": e.offsetX, "e.currentTarget.offsetWidth": e.currentTarget.offsetWidth, leftRatio: leftRatio });
-    //    timer.set(150);
-    //    e.preventDefault();
-    //    //if(e.deltaY>0)
-    //    //    chart.zoom2.zoomIn();
-    //    //else if(e.deltaY<0)
-    //    //    chart.zoom2.zoomOut();
-    //    //console.log(e.deltaX, e.deltaY, e.deltaFactor);
-    //});
-
     window.setInterval(refreshStatus, 1000);
 
     function refreshStatus() {
@@ -75,17 +48,6 @@ function main() {
         };
         $("#status").text(JSON.stringify(info, null, " "));
     }
-    //function doZoom() {
-    //    if (deltaY != 0) {
-    //        var maxDelta = 10;
-    //        var multiply = (maxDelta + deltaY) / maxDelta;
-    //        //var factor = chart.zoom2.factor()*multiply;
-    //        //factor= Math.ceil(factor*100) / 100;
-    //        console.log({ deltaY: deltaY, multiply: multiply });
-    //        chart.zoom2.zoomAndPanByRatio(multiply, leftRatio);//0.5);//leftRatio);
-    //        deltaY = 0;
-    //    }
-    //}
 
 };
 
diff --git a/htdocs/samples/zoom2.html b/htdocs/samples/zoom2.html
index 7987ce2..87691d9 100644
--- a/htdocs/samples/zoom2.html
+++ b/htdocs/samples/zoom2.html
@@ -40,6 +40,8 @@
             <button onclick="chart.zoom2.reset()">reset</button>
         </div>
         <div id="divChart" style="height:300px"></div>
+        <h3>Notes</h3>
+        <p>Only 'columns' data format is supported for now.</p>
     </div>
 </body>
 </html>