diff --git a/c3.js b/c3.js
index e81cad9..a00f466 100644
--- a/c3.js
+++ b/c3.js
@@ -125,7 +125,7 @@
                     value = '-';
                     name = '-';
                 }
-                text += "<tr><td><span style='background-color:"+color(d[i].id)+"'></span>" + name + "</td><td class='value'>" + value + "</td></tr>";
+                text += "<tr class='-tooltip-name-"+d[i].id+"'><td class='name'><span style='background-color:"+color(d[i].id)+"'></span>" + name + "</td><td class='value'>" + value + "</td></tr>";
             }
             return text + "</table>";
         }),
diff --git a/c3.min.js b/c3.min.js
index 97faafa..4a1517f 100644
--- a/c3.min.js
+++ b/c3.min.js
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-b.push(c);return e[b.indexOf(c)%e.length]}}(Xc,Yc),oc=function(){var a=[[d3.time.format("%Y/%-m/%-d"),function(){return!0}],[d3.time.format("%-m/%-d"),function(a){return a.getMonth()}],[d3.time.format("%-m/%-d"),function(a){return 1!=a.getDate()}],[d3.time.format("%-m/%-d"),function(a){return a.getDay()&&1!=a.getDate()}],[d3.time.format("%I %p"),function(a){return a.getHours()}],[d3.time.format("%I:%M"),function(a){return a.getMinutes()}],[d3.time.format(":%S"),function(a){return a.getSeconds()}],
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