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diff --git a/src/cmd/hgpatch/doc.go b/src/cmd/hgpatch/doc.go
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+// Copyright 2009 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.
+
+/*
+
+Hgpatch applies a patch to the local Mercurial repository.
+The patch should have been been generated by
+a version control system like CVS, Git, Mercurial, or Subversion.
+If successful, hgpatch writes a list of affected files to standard output.
+
+Hgpatch is meant to be used by the Mercurial codereview extension.
+
+Usage:
+	hgpatch [patchfile]
+
+*/
+package documentation