diff --git a/go1.21rc4/main.go b/go1.21rc4/main.go
new file mode 100644
index 0000000..a3e9855
--- /dev/null
+++ b/go1.21rc4/main.go
@@ -0,0 +1,24 @@
+// Copyright 2023 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 go1.21rc4 command runs the go command from Go 1.21rc4.
+//
+// To install, run:
+//
+//	$ go install golang.org/dl/go1.21rc4@latest
+//	$ go1.21rc4 download
+//
+// And then use the go1.21rc4 command as if it were your normal go
+// command.
+//
+// See the release notes at https://tip.golang.org/doc/go1.21.
+//
+// File bugs at https://go.dev/issue/new.
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.21rc4")
+}