diff --git a/LICENSE b/LICENSE
index 6a66aea..2a7cf70 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2009 The Go Authors. All rights reserved.
+Copyright 2009 The Go Authors.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -10,7 +10,7 @@ notice, this list of conditions and the following disclaimer.
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
-   * Neither the name of Google Inc. nor the names of its
+   * Neither the name of Google LLC nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.
 
diff --git a/go.mod b/go.mod
index 46ac917..176cc09 100644
--- a/go.mod
+++ b/go.mod
@@ -1 +1,3 @@
 module golang.org/x/time
+
+go 1.18
diff --git a/rate/rate.go b/rate/rate.go
index f0e0cf3..8f6c7f4 100644
--- a/rate/rate.go
+++ b/rate/rate.go
@@ -52,6 +52,8 @@ func Every(interval time.Duration) Limit {
 // or its associated context.Context is canceled.
 //
 // The methods AllowN, ReserveN, and WaitN consume n tokens.
+//
+// Limiter is safe for simultaneous use by multiple goroutines.
 type Limiter struct {
 	mu     sync.Mutex
 	limit  Limit
diff --git a/rate/rate_test.go b/rate/rate_test.go
index a063e35..48ebaef 100644
--- a/rate/rate_test.go
+++ b/rate/rate_test.go
@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.7
-// +build go1.7
-
 package rate
 
 import (