From a219f7c30dde1198671bb984e91cba0b6664179f Mon Sep 17 00:00:00 2001
From: Konstantin Baierer <unixprog@gmail.com>
Date: Sun, 7 Jun 2020 15:38:49 +0200
Subject: [PATCH] CLI: If METS is not readable, show help and exit 1,
 OCR-D/core#438

---
 cli.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cli.md b/cli.md
index 7e51402..a320558 100644
--- a/cli.md
+++ b/cli.md
@@ -83,6 +83,9 @@ Omit to use default parameters only, or for processors without any parameters.
 
 Input [METS](mets) URL. Default: `mets.xml`
 
+If `METS_IN` is a file path but the file is not readable, processors must
+show the [`--help` message](#-h---help) message and exit with return code `1`.
+
 ### `-w, --working-dir DIR`
 
 Working Directory. Default: current working directory.