diff --git a/app.js b/app.js
index 372ee2b..e0a9bce 100644
--- a/app.js
+++ b/app.js
@@ -30,7 +30,12 @@ yDomain = d3.extent(runs, function(datum, index){
 })
 yScale.domain(yDomain);
 
-d3.selectAll('circle').data(runs)
+d3.select('svg').selectAll('circle')
+    .data(runs)
+    .enter()
+    .append('circle');
+
+d3.selectAll('circle')
     .attr('cy', function(datum, index){
         return yScale(datum.distance);
     });
diff --git a/index.html b/index.html
index 0c0058e..c756f85 100644
--- a/index.html
+++ b/index.html
@@ -6,11 +6,7 @@
         <link rel="stylesheet" href="app.css">
     </head>
     <body>
-        <svg>
-            <circle/>
-            <circle/>
-            <circle/>
-        </svg>
+        <svg></svg>
         <script src="https://d3js.org/d3.v4.min.js"></script>
         <script src="app.js" charset="utf-8"></script>
     </body>
