diff --git a/config.go b/config.go
index 8d066dd96..e345b4e3f 100644
--- a/config.go
+++ b/config.go
@@ -266,7 +266,7 @@ type Config struct {
 	RawRESTListeners  []string `long:"restlisten" description:"Add an interface/port/socket to listen for REST connections"`
 	RawListeners      []string `long:"listen" description:"Add an interface/port to listen for peer connections"`
 	RawExternalIPs    []string `long:"externalip" description:"Add an ip:port to the list of local addresses we claim to listen on to peers. If a port is not specified, the default (9735) will be used regardless of other parameters"`
-	ExternalHosts     []string `long:"externalhosts" description:"A set of hosts that should be periodically resolved to announce IPs for"`
+	ExternalHosts     []string `long:"externalhosts" description:"Add a hostname:port that should be periodically resolved to announce IPs for. If a port is not specified, the default (9735) will be used."`
 	RPCListeners      []net.Addr
 	RESTListeners     []net.Addr
 	RestCORS          []string `long:"restcors" description:"Add an ip:port/hostname to allow cross origin access from. To allow all origins, set as \"*\"."`