diff --git a/content/developer/reference/guidelines.rst b/content/developer/reference/guidelines.rst
index f3c09ff33..d66c6c2ab 100644
--- a/content/developer/reference/guidelines.rst
+++ b/content/developer/reference/guidelines.rst
@@ -438,7 +438,6 @@ Inside these 3 groups, the imported lines are alphabetically sorted.
 Idiomatics of Programming (Python)
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-- Each python file should have ``# -*- coding: utf-8 -*-`` as first line.
 - Always favor *readability* over *conciseness* or using the language features or idioms.
 - Don't use ``.clone()``