diff --git a/src/runtime/lookup_darwin.go b/src/runtime/lookup_darwin.go
index 2b2ca97fed68b5..c39b937ccfc554 100644
--- a/src/runtime/lookup_darwin.go
+++ b/src/runtime/lookup_darwin.go
@@ -1,3 +1,7 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package runtime
 
 import (
diff --git a/src/runtime/lookup_darwin_arm.s b/src/runtime/lookup_darwin_arm.s
index 9f3648203dcfe9..bf69d212136907 100644
--- a/src/runtime/lookup_darwin_arm.s
+++ b/src/runtime/lookup_darwin_arm.s
@@ -10,9 +10,9 @@
 #include "go_tls.h"
 #include "textflag.h"
 
-// On darwin/arm, the runtime always use runtime/cgo
-// for resolution. This will just exit with nominal
-// exit code
+// On darwin/arm, the runtime always uses runtime/cgo
+// for resolution. This will just exit with a nominal
+// exit code.
 
 TEXT runtime·res_search_trampoline(SB),NOSPLIT,$0
     MOVW    $90, R0
diff --git a/src/runtime/lookup_darwin_arm64.s b/src/runtime/lookup_darwin_arm64.s
index 1bfe931c7ddeae..31061e15c032b9 100644
--- a/src/runtime/lookup_darwin_arm64.s
+++ b/src/runtime/lookup_darwin_arm64.s
@@ -6,9 +6,9 @@
 #include "go_tls.h"
 #include "textflag.h"
 
-// On darwin/arm, the runtime always use runtime/cgo
-// for resolution. This will just exit with nominal
-// exit code
+// On darwin/arm, the runtime always uses runtime/cgo
+// for resolution. This will just exit with a nominal
+// exit code.
 
 TEXT runtime·res_search_trampoline(SB),NOSPLIT,$0
     MOVW    $90, R0