diff --git a/package.json b/package.json
index ab1259a..a5e0630 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   "scripts": {
     "lint": "standard",
     "bench": "node bench/index.js",
+    "preview": "node test/serve-preview.js",
     "test": "tap test/*.spec.js --reporter spec",
     "start": "node service.js",
     "predeploy": "now rm badgen --safe -y -T badgen",
diff --git a/test/PREVIEW.md b/test/PREVIEW.md
index 71c10a9..82f3321 100644
--- a/test/PREVIEW.md
+++ b/test/PREVIEW.md
@@ -19,3 +19,4 @@
 |![](http://localhost:3000/chat/gitter/purple) | http://localhost:3000/chat/gitter/purple |
 |![](http://localhost:3000/style/standard/f2a) | http://localhost:3000/style/standard/f2a |
 |![](http://localhost:3000/license/Apache-2.0/blue) | http://localhost:3000/license/Apache-2.0/blue |
+|![](http://localhost:3000/Language/Swift%203.0.1/orange) | http://localhost:3000/Language/Swift%203.0.1/orange |
diff --git a/test/serve.js b/test/serve-preview.js
similarity index 79%
rename from test/serve.js
rename to test/serve-preview.js
index 578daed..b43ab67 100644
--- a/test/serve.js
+++ b/test/serve-preview.js
@@ -1,12 +1,16 @@
 const http = require('http')
 const path = require('path')
+const qs = require('querystring')
 const serveMarked = require('serve-marked')
 const badgen = require('..')
 
 // @example
 // http://localhost:3000/npm/v1.2.3
 const serveBadge = (req, res) => {
-  const [ subject, status, color ] = req.url.split('/').filter(Boolean)
+  const [ subject, status, color ] = req.url.split('/')
+    .filter(Boolean)
+    .map(s => qs.unescape(s))
+
   res.writeHead(200, { 'Content-Type': 'image/svg+xml;charset=utf-8' })
   res.end(badgen({subject, status, color}))
 }
@@ -29,9 +33,7 @@ const serveIndex = serveMarked(md, {
 
 http.createServer((req, res) => {
   switch (req.url) {
-    case '/':
-      return serveIndex(req, res)
-    default:
-      return serveBadge(req, res)
+    case '/': return serveIndex(req, res)
+    default: return serveBadge(req, res)
   }
 }).listen(3000)