From 6b7dd2408a7984154612c215cd72b2b297f0d2ce Mon Sep 17 00:00:00 2001
From: Thomas Lange <code@nerdmind.de>
Date: Fri, 28 Apr 2017 20:29:00 +0200
Subject: Information about key syntax added.

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

diff --git a/Arguments.md b/Arguments.md
index 7fe781d..6d6d3bd 100644
--- a/Arguments.md
+++ b/Arguments.md
@@ -23,5 +23,8 @@ You even can add an preview image functionality. What if you want to show an pre
 		<img class="preview-img" href="<?=Application::getFileURL("images/preview/{$POST['ARGV']['PREVIEW_IMG']}")?>" alt="" />
 	<?php endif; ?>
 
+## Syntax
+Each argument key (the part before the `=`) must only contain letters from `A-Z`, `a-z`, `0-9` and underscores (`_`)!
+
 ## Conclusion
 The use cases of the arguments are practically unlimited. Please note that the `standard` template does not use any arguments provided in the argument field. It is up to you whether you implement this in your own template to do something special or not!
\ No newline at end of file
-- 
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