diff --git a/_posts/plotly_js/fundamentals/hover/2015-10-08-rounding-hover-values.html b/_posts/plotly_js/fundamentals/hover/2015-10-08-rounding-hover-values.html
index 3ed3b815c..14b852891 100644
--- a/_posts/plotly_js/fundamentals/hover/2015-10-08-rounding-hover-values.html
+++ b/_posts/plotly_js/fundamentals/hover/2015-10-08-rounding-hover-values.html
@@ -7,7 +7,7 @@
 arrangement: horizontal
 ---
 // Round x and y hover values by setting hoverformat in layout.xaxis and/or layout.yaxis
-// using D3 number formatting ( https://github.com/mbostock/d3/wiki/Formatting )
+// using D3 number formatting ( https://github.com/d3/d3-format/blob/master/README.md#locale_format )
 
 var d3 = Plotly.d3,
     N = 40,
@@ -28,4 +28,4 @@
         yaxis:{zeroline:false, hoverformat: '.2r', title: 'Rounded: 2 significant values on hover'}
      };
 
-Plotly.newPlot('myDiv', data, layout);
\ No newline at end of file
+Plotly.newPlot('myDiv', data, layout);