diff --git a/main.ts b/main.ts
index 608b110..f230e36 100644
--- a/main.ts
+++ b/main.ts
@@ -11,7 +11,7 @@ await new Command()
 	.version('0.1.0')
 	.option('-g, --group <group:string>', 'Name of the group to add users in.')
 	.option(
-		'-o, --only-add [only-add:boolean]',
+		'-a, --only-add [only-add:boolean]',
 		"Don't create users, only add them to a group",
 	)
 	.option('-d, --endpoint <endpoint:string>', 'Redmine server address.', {