diff --git a/bin/run.sh b/bin/run.sh
index b09f619..a835536 100755
--- a/bin/run.sh
+++ b/bin/run.sh
@@ -18,7 +18,7 @@ while [ $# -gt 0 ]; do
       ;;
     *)
       printf "***************************\n"
-      printf "* Error: Invalid argument.*\n"
+      printf "* Warning: Unknown argument.*\n"
       printf "***************************\n"
       exit 1
   esac