diff --git a/chapter2/mysite/myapp/static/scripts/trend.js b/chapter2/mysite/myapp/static/scripts/trend.js
index 55c61d5..1dd5fe4 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'].substring(0,20));
+      histogramChart3_names.push(data['product_name'].substring(0,15));
       histogramChart3_datas.push(data['good_c']);
       var rate = data['good_c'] * 100 / base['good_c'];
       histogramChart3_rates.push(rate.toFixed(0));