diff --git a/pep-0699.rst b/pep-0699.rst
index d655528f4..75bd3e30e 100644
--- a/pep-0699.rst
+++ b/pep-0699.rst
@@ -91,6 +91,13 @@ are commonly used, and any increase in their memory consumption will adversely
 affect Python’s performance.
 
 
+Reference Implementation
+========================
+
+A reference implementation can be found in
+`python/cpython#101193 <https://github.com/python/cpython/pull/101193>`_.
+
+
 Special Thanks
 ==============