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diff --git a/libgo/go/cmath/abs.go b/libgo/go/cmath/abs.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.
+
+// The cmath package provides basic constants
+// and mathematical functions for complex numbers.
+package cmath
+
+import "math"
+
+// Abs returns the absolute value (also called the modulus) of x.
+func Abs(x complex128) float64 { return math.Hypot(real(x), imag(x)) }