diff --git a/patterns/package-design.md b/patterns/package-design.md
index a9db1bc..9da67b6 100644
--- a/patterns/package-design.md
+++ b/patterns/package-design.md
@@ -379,12 +379,12 @@ srv := &http.Server{
 
 ## 7. Constructor Pattern — NewX Functions
 
-### Source: [src/net/http/server.go#L2639](https://github.com/golang/go/blob/17bd5ab8c650155dd2bd09f7005726552639eea0/src/net/http/server.go#L2639), [src/database/sql/sql.go#L836](https://github.com/golang/go/blob/17bd5ab8c650155dd2bd09f7005726552639eea0/src/database/sql/sql.go#L836)
+### Source: [src/net/http/server.go#L2638](https://github.com/golang/go/blob/17bd5ab8c650155dd2bd09f7005726552639eea0/src/net/http/server.go#L2638), [src/database/sql/sql.go#L836](https://github.com/golang/go/blob/17bd5ab8c650155dd2bd09f7005726552639eea0/src/database/sql/sql.go#L836)
 
 ```go
-// src/net/http/server.go:2639
+// src/net/http/server.go:2638
 func NewServeMux() *ServeMux {
-    return new(ServeMux)
+    return &ServeMux{}
 }
 
 // [src/database/sql/sql.go#L836](https://github.com/golang/go/blob/17bd5ab8c650155dd2bd09f7005726552639eea0/src/database/sql/sql.go#L836)