diff --git a/src/fop.rs b/src/fop.rs
index cd04f85..4f80bd6 100644
--- a/src/fop.rs
+++ b/src/fop.rs
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Emma Tebibyte <emma@tebibyte.media>
+ * Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -50,7 +50,7 @@ fn main() {
 	let command_arg = arg_parser.index() + 1;
 
 	argv.get(command_arg).unwrap_or_else(|| {
-		eprintln!("Usage: {} index command [args...]", argv[0]);
+		eprintln!("Usage: {} [-d delimiter] index command [args...]", argv[0]);
 		exit(EX_USAGE);
 	});