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diff --git a/Doc/library/abc.rst b/Doc/library/abc.rst
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@@ -8,8 +8,8 @@
.. sectionauthor:: Georg Brandl
.. much of the content adapted from docstrings
-This module provides the infrastructure for defining :term:`abstract base
-classes` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
+This module provides the infrastructure for defining an :term:`abstract base
+class` (ABCs) in Python, as outlined in :pep:`3119`; see the PEP for why this
was added to Python. (See also :pep:`3141` and the :mod:`numbers` module
regarding a type hierarchy for numbers based on ABCs.)