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diff --git a/src/cmd/go/internal/modload/help.go b/src/cmd/go/internal/modload/help.go
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+// 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 modload
+
+import "cmd/go/internal/base"
+
+var HelpModules = &base.Command{
+	UsageLine: "modules",
+	Short:     "modules, module versions, and more",
+	Long: `
+Modules are how Go manages dependencies.
+
+A module is a collection of packages that are released, versioned, and
+distributed together. Modules may be downloaded directly from version control
+repositories or from module proxy servers.
+
+For a series of tutorials on modules, see
+https://golang.org/doc/tutorial/create-module.
+
+For a detailed reference on modules, see https://golang.org/ref/mod.
+
+By default, the go command may download modules from https://proxy.golang.org.
+It may authenticate modules using the checksum database at
+https://sum.golang.org. Both services are operated by the Go team at Google.
+The privacy policies for these services are available at
+https://proxy.golang.org/privacy and https://sum.golang.org/privacy,
+respectively.
+
+The go command's download behavior may be configured using GOPROXY, GOSUMDB,
+GOPRIVATE, and other environment variables. See 'go help environment'
+and https://golang.org/ref/mod#private-module-privacy for more information.
+	`,
+}
+
+var HelpGoMod = &base.Command{
+	UsageLine: "go.mod",
+	Short:     "the go.mod file",
+	Long: `
+A module version is defined by a tree of source files, with a go.mod
+file in its root. When the go command is run, it looks in the current
+directory and then successive parent directories to find the go.mod
+marking the root of the main (current) module.
+
+The go.mod file format is described in detail at
+https://golang.org/ref/mod#go-mod-file.
+
+To create a new go.mod file, use 'go mod init'. For details see
+'go help mod init' or https://golang.org/ref/mod#go-mod-init.
+
+To add missing module requirements or remove unneeded requirements,
+use 'go mod tidy'. For details, see 'go help mod tidy' or
+https://golang.org/ref/mod#go-mod-tidy.
+
+To add, upgrade, downgrade, or remove a specific module requirement, use
+'go get'. For details, see 'go help module-get' or
+https://golang.org/ref/mod#go-get.
+
+To make other changes or to parse go.mod as JSON for use by other tools,
+use 'go mod edit'. See 'go help mod edit' or
+https://golang.org/ref/mod#go-mod-edit.
+	`,
+}