From ac12de2e6a6f5c1da83de0412bb7d03c28fdab63 Mon Sep 17 00:00:00 2001
From: Ralf Gommers <ralf.gommers@gmail.com>
Date: Wed, 26 Mar 2025 13:02:52 +0100
Subject: document that `sys._is_gil_enabled` is CPython-specific (#131748)

---
 Doc/library/sys.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 2bdfb33..bb88cf7 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -1247,6 +1247,9 @@ always available. Unless explicitly noted otherwise, all variables are read-only
 
    .. versionadded:: 3.13
 
+   .. impl-detail::
+
+      It is not guaranteed to exist in all implementations of Python.
 
 .. function:: is_finalizing()
 
-- 
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