diff --git a/ch6-web/ch6-03-middleware.md b/ch6-web/ch6-03-middleware.md
index 895a45b..ef6acbe 100644
--- a/ch6-web/ch6-03-middleware.md
+++ b/ch6-web/ch6-03-middleware.md
@@ -137,13 +137,13 @@ type Handler interface {
 
 ```go
 type Handler interface {
-        ServeHTTP(ResponseWriter, *Request)
+    ServeHTTP(ResponseWriter, *Request)
 }
 
 type HandlerFunc func(ResponseWriter, *Request)
 
 func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request)
-     f(w, r)
+    f(w, r)
 }
 
 ```