diff --git a/chapter2/mysite/myapp/static/scripts/trend.js b/chapter2/mysite/myapp/static/scripts/trend.js
index 71ec766..3382801 100755
--- a/chapter2/mysite/myapp/static/scripts/trend.js
+++ b/chapter2/mysite/myapp/static/scripts/trend.js
@@ -239,7 +239,7 @@ $(function(){
    for(var key in top10_sells){
     var base = top10_sells[0];
     var data = top10_sells[key];
-    histogramChart3_names.push(data['product_name']);
+    histogramChart3_names.push(data['product_name'].substring(0,10));
     histogramChart3_datas.push(data['good_c']);
     var rate = data['good_c'] * 100 / base['good_c'];
     histogramChart3_rates.push(rate.toFixed(0));