diff --git a/makedemo.py b/makedemo.py
index 93cbe93..612cef6 100644
--- a/makedemo.py
+++ b/makedemo.py
@@ -64,7 +64,7 @@ def minify_js(src_js, min_js):
     template = jinja2_env.get_template('index.html')
     html = template.render(names=name_dict, registry=rendering_dict,
                            num_cities=cities)
-    with codecs.open('index.html', 'wb', 'utf-8') as f:
+    with codecs.open('preview.html', 'wb', 'utf-8') as f:
         f.write(html)
 
     config = jinja2_env.get_template('config.json')
diff --git a/index.html b/preview.html
similarity index 100%
rename from index.html
rename to preview.html