diff --git a/main.go b/main.go
index a5432a2..f63aa02 100644
--- a/main.go
+++ b/main.go
@@ -8,7 +8,7 @@ import (
 
 func main() {
 	if len(os.Args) < 2 {
-		fmt.Fprintf(os.Stderr, "usage: mailchk <email>\n")
+		fmt.Fprintf(os.Stderr, "usage: mailchk <email> [<email>, ...]\n")
 		os.Exit(1)
 	}