Issue #16138: fix typo.
diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index 7cd9905..2151350 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -562,7 +562,7 @@
sequence
An :term:`iterable` which supports efficient element access using integer
indices via the :meth:`__getitem__` special method and defines a
- :meth:`len` method that returns the length of the sequence.
+ :meth:`__len__` method that returns the length of the sequence.
Some built-in sequence types are :class:`list`, :class:`str`,
:class:`tuple`, and :class:`bytes`. Note that :class:`dict` also
supports :meth:`__getitem__` and :meth:`__len__`, but is considered a