diff --git a/src/os/sys_bsd.go b/src/os/sys_bsd.go
index 8ad5e21837..78705c286d 100644
--- a/src/os/sys_bsd.go
+++ b/src/os/sys_bsd.go
@@ -4,9 +4,6 @@
 
 // +build darwin dragonfly freebsd nacl netbsd openbsd
 
-// os code shared between *BSD systems including OS X (Darwin)
-// and FreeBSD.
-
 package os
 
 import "syscall"
diff --git a/src/os/sys_linux.go b/src/os/sys_linux.go
index 467127653a..36a8a24455 100644
--- a/src/os/sys_linux.go
+++ b/src/os/sys_linux.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.
 
-// Linux-specific
-
 package os
 
 import (
diff --git a/src/os/sys_plan9.go b/src/os/sys_plan9.go
index 07a7905f47..40374eb242 100644
--- a/src/os/sys_plan9.go
+++ b/src/os/sys_plan9.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.
 
-// Plan 9-specific
-
 package os
 
 func hostname() (name string, err error) {