diff --git a/Readme.md b/Readme.md
index 229b57c..9c3526a 100644
--- a/Readme.md
+++ b/Readme.md
@@ -53,7 +53,7 @@ app.use(function *(next){
   const start = new Date;
   yield next;
   const ms = new Date - start;
-  console.log('%s %s - %s', this.method, this.url, ms);
+  console.log(`${this.method} ${this.url} - ${ms}`);
 });
 
 // response