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diff --git a/libgo/go/cmd/go/internal/modcmd/mod.go b/libgo/go/cmd/go/internal/modcmd/mod.go
new file mode 100644
index 00000000000..f150cc9728a
--- /dev/null
+++ b/libgo/go/cmd/go/internal/modcmd/mod.go
@@ -0,0 +1,31 @@
+// Copyright 2018 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 modcmd implements the ``go mod'' command.
+package modcmd
+
+import "cmd/go/internal/base"
+
+var CmdMod = &base.Command{
+	UsageLine: "go mod",
+	Short:     "module maintenance",
+	Long: `Go mod provides access to operations on modules.
+
+Note that support for modules is built into all the go commands,
+not just 'go mod'. For example, day-to-day adding, removing, upgrading,
+and downgrading of dependencies should be done using 'go get'.
+See 'go help modules' for an overview of module functionality.
+	`,
+
+	Commands: []*base.Command{
+		cmdDownload,
+		cmdEdit,
+		cmdGraph,
+		cmdInit,
+		cmdTidy,
+		cmdVendor,
+		cmdVerify,
+		cmdWhy,
+	},
+}