diff --git a/cmd/bootnode/main.go b/cmd/bootnode/main.go
index 036b968ef..748113aa4 100644
--- a/cmd/bootnode/main.go
+++ b/cmd/bootnode/main.go
@@ -40,7 +40,7 @@ func main() {
 		writeAddr   = flag.Bool("writeaddress", false, "write out the node's public key and quit")
 		nodeKeyFile = flag.String("nodekey", "", "private key filename")
 		nodeKeyHex  = flag.String("nodekeyhex", "", "private key as hex (for testing)")
-		natdesc     = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
+		natdesc     = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|pmp:<IP>|extip:<IP>)")
 		netrestrict = flag.String("netrestrict", "", "restrict network communication to the given IP networks (CIDR masks)")
 		runv5       = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
 		verbosity   = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-5)")
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 9997755cf..541c8ee82 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -828,7 +828,7 @@ var (
 	}
 	NATFlag = &cli.StringFlag{
 		Name:     "nat",
-		Usage:    "NAT port mapping mechanism (any|none|upnp|pmp|extip:<IP>)",
+		Usage:    "NAT port mapping mechanism (any|none|upnp|pmp|pmp:<IP>|extip:<IP>)",
 		Value:    "any",
 		Category: flags.NetworkingCategory,
 	}