diff --git a/src/cmd/dist/doc.go b/src/cmd/dist/doc.go
new file mode 100644
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+++ b/src/cmd/dist/doc.go
@@ -0,0 +1,19 @@
+// Copyright 2017 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.
+
+// dist is the bootstrapping tool for the Go distribution.
+//
+// Usage:
+//   go tool dist [command]
+//
+// The commands are:
+//   banner         print installation banner
+//   bootstrap      rebuild everything
+//   clean          deletes all built files
+//   env [-p]       print environment (-p: include $PATH)
+//   install [dir]  install individual directory
+//   list [-json]   list all supported platforms
+//   test [-h]      run Go test(s)
+//   version        print Go version
+package main