Add a missing :term:.

diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst
index 11de8b169cc8ca46d1153c249e1279f62672aef8..810cea8ba484b2039b9e2285886405275ed2bb73 100644 (file)
--- a/Doc/library/contextlib.rst
+++ b/Doc/library/contextlib.rst
@@ -20,7 +20,7 @@ Functions and classes provided:
 
 .. class:: AbstractContextManager
 
-   An abstract base class for classes that implement
+   An :term:`abstract base class` for classes that implement
    :meth:`object.__enter__` and :meth:`object.__exit__`. A default
    implementation for :meth:`object.__enter__` is provided which returns
    ``self`` while :meth:`object.__exit__` is an abstract method which by default