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diff --git a/libgo/go/math/exp2.go b/libgo/go/math/exp2.go
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+++ b/libgo/go/math/exp2.go
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+// Copyright 2010 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 math
+
+// Exp2 returns 2**x, the base-2 exponential of x.
+//
+// Special cases are the same as Exp.
+func Exp2(x float64) float64 { return Exp(x * Ln2) }