Add punctuation
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 8652453..299ff56 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1315,7 +1315,7 @@
.. [#] In Python 2.3, a list comprehension "leaks" the control variables of each
``for`` it contains into the containing scope. However, this behavior is
deprecated, and relying on it will not work once this bug is fixed in a future
- release
+ release.
.. [#] While ``abs(x%y) < abs(y)`` is true mathematically, for floats it may not be
true numerically due to roundoff. For example, and assuming a platform on which