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diff --git a/src/cmd/5a/doc.go b/src/cmd/5a/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.
+
+/*
+
+5a is a version of the Plan 9 assembler.  The original is documented at
+
+	http://plan9.bell-labs.com/magic/man2html/1/2a
+
+Its target architecture is the ARM, referred to by these tools as arm.
+
+*/
+package documentation