diff --git a/ch5-web/ch5-03-middleware.md b/ch5-web/ch5-03-middleware.md
index 75d4d0b..443b782 100644
--- a/ch5-web/ch5-03-middleware.md
+++ b/ch5-web/ch5-03-middleware.md
@@ -142,7 +142,7 @@ type Handler interface {
 
 type HandlerFunc func(ResponseWriter, *Request)
 
-func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request){
+func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request) {
 	f(w, r)
 }