diff --git a/scripts/boxes b/scripts/boxes
index 1f40f8b..9530437 100755
--- a/scripts/boxes
+++ b/scripts/boxes
@@ -35,6 +35,6 @@ def main():
         for name in sorted(modules):
             print(" * ", name)
     else:
-        print("unknown sub command")
+        print("Unknown generator name. Use boxes --list to get a list of available commands.")
 
 main()