Tweak error message.
diff --git a/main.c b/main.c
index e3f6ddf..cfa920e 100644
--- a/main.c
+++ b/main.c
@@ -94,7 +94,7 @@
 	if (toys.argv[1]) {
 		if (toys.argv[1][0]!='-') {
 			toy_exec(toys.argv+1);
-			error_exit("No behavior for %s\n",toys.argv[1]);
+			error_exit("Unknown command %s\n",toys.argv[1]);
 		}
 	}