From 46e2cf7169955e54d80687ab19a7d237f9e02cf3 Mon Sep 17 00:00:00 2001
From: Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>
Date: Wed, 5 Jun 2024 18:21:31 -0500
Subject: [PATCH] Add note to PEP-746 about  raising NotImplementedError
 (#3822)

---
 peps/pep-0746.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/peps/pep-0746.rst b/peps/pep-0746.rst
index cfcb290db..cf94f3203 100644
--- a/peps/pep-0746.rst
+++ b/peps/pep-0746.rst
@@ -89,6 +89,13 @@ For example, to support a generic ``Gt`` metadata, one might write::
 Implementations may be generic and may use overloads that return ``Literal[True]`` or ``Literal[False]``
 to indicate if the metadata is valid for the given type.
 
+Implementations may raise a NotImplementedError if they cannot determine if the metadata is valid for the given type.
+Tools calling ``__supports_type__`` at runtime should catch this exception and treat it as if ``__supports_type__``
+was not present; they should not take this as an indication that the metadata is invalid for the type.
+
+Tools that use the metadata at runtime may choose to ignore the implementation of ``__supports_type__``; this PEP does not
+specify how the method should be used at runtime, only that it may be available for use.
+
 Backwards Compatibility
 =======================