diff --git a/pool.go b/pool.go
index f860aa7f..36a2ef4e 100644
--- a/pool.go
+++ b/pool.go
@@ -1,5 +1,13 @@
+// Copyright 2011 Miek Gieben. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package dns
 
+// Inspired copied from:
+// http://blog.cloudflare.com/recycling-memory-buffers-in-go
+// ... carries no lisence
+
 import (
 	"container/list"
 	"time"
diff --git a/server.go b/server.go
index 86487967..a0000da3 100644
--- a/server.go
+++ b/server.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !appengine
-
 // DNS server implementation.
 
 package dns
diff --git a/server_test.go b/server_test.go
index 37c40f41..a0f39d86 100644
--- a/server_test.go
+++ b/server_test.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !appengine
-
 package dns
 
 import (
diff --git a/xfr.go b/xfr.go
index 493135ad..28b3c644 100644
--- a/xfr.go
+++ b/xfr.go
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !appengine
-
 package dns
 
 import (