diff --git a/src/cmd/9g/doc.go b/src/cmd/9g/doc.go
new file mode 100644
index 00000000000..200be2eda2c
--- /dev/null
+++ b/src/cmd/9g/doc.go
@@ -0,0 +1,16 @@
+// Copyright 2014 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.
+
+// +build ignore
+
+/*
+
+9g is the version of the gc compiler for the Power64.
+The $GOARCH for these tools is power64 (big endian) or
+power64le (little endian).
+
+It reads .go files and outputs .9 files. The flags are documented in ../gc/doc.go.
+
+*/
+package main