diff --git a/cmd/ghcs/ports.go b/cmd/ghcs/ports.go
index 0f2460e0a..09397af54 100644
--- a/cmd/ghcs/ports.go
+++ b/cmd/ghcs/ports.go
@@ -241,7 +241,7 @@ func updatePortVisibility(log *output.Logger, codespaceName, sourcePort string,
 
 func NewPortsForwardCmd() *cobra.Command {
 	return &cobra.Command{
-		Use:   "forward <codespace> <source-port> <destination-port>",
+		Use:   "forward <codespace> <source-port>:<destination-port>",
 		Short: "Forward ports",
 		Args:  cobra.MinimumNArgs(2),
 		RunE: func(cmd *cobra.Command, args []string) error {