diff --git a/cmd/ssh-chat/cmd.go b/cmd/ssh-chat/cmd.go
index 1566a16..8b4e081 100644
--- a/cmd/ssh-chat/cmd.go
+++ b/cmd/ssh-chat/cmd.go
@@ -38,6 +38,7 @@ type Options struct {
 	Version    bool     `long:"version" description:"Print version and exit."`
 	Allowlist  string   `long:"allowlist" description:"Optional file of public keys who are allowed to connect."`
 	Whitelist  string   `long:"whitelist" dexcription:"Old name for allowlist option"`
+	Keynames   bool     `long:"keynames" description:"Reserve usernames by appending them (after a space) to their keys in the admin or allowlist files."`
 	Passphrase string   `long:"unsafe-passphrase" description:"Require an interactive passphrase to connect. Allowlist feature is more secure."`
 }
 
@@ -157,6 +158,8 @@ func main() {
 	}
 	auth.SetAllowlistMode(options.Allowlist != "")
 
+	auth.SetKeynamesMode(options.Keynames)
+
 	if options.Motd != "" {
 		host.GetMOTD = func() (string, error) {
 			motd, err := ioutil.ReadFile(options.Motd)