diff --git a/cmd/modhex.go b/cmd/modhex.go
index b4c26bf..55fcbd7 100644
--- a/cmd/modhex.go
+++ b/cmd/modhex.go
@@ -28,6 +28,7 @@ func main() {
 	}
 	flag.Parse()
 
+	// display usage if no data is provided
 	if flag.NArg() < 1 {
 		flag.Usage()
 		os.Exit(0)