diff --git a/lib/assets/javascripts/cdb/examples/stacked.html b/lib/assets/javascripts/cdb/examples/stacked.html
index 1d59852..8a00429 100644
--- a/lib/assets/javascripts/cdb/examples/stacked.html
+++ b/lib/assets/javascripts/cdb/examples/stacked.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="zh">
   <head>
     <meta charset="UTF-8">
     <title>Legends | CartoDB.js</title>
