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diff --git a/pkg/sentry/fs/fsutil/fsutil.go b/pkg/sentry/fs/fsutil/fsutil.go
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+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package fsutil provides utilities for implementing fs.InodeOperations
+// and fs.FileOperations:
+//
+// - For embeddable utilities, see inode.go and file.go.
+//
+// - For fs.Inodes that require a page cache to be memory mapped, see
+// inode_cache.go.
+//
+// - For fs.Files that implement fs.HandleOps, see handle.go.
+//
+// - For anon fs.Inodes, see anon.go.
+package fsutil