Issue #14448: add reference to IANA timezone database; thanks to Georg/Nick suggestions
diff --git a/Doc/library/datetime.rst b/Doc/library/datetime.rst
index b80c6a8..1c4e9b9 100644
--- a/Doc/library/datetime.rst
+++ b/Doc/library/datetime.rst
@@ -1560,11 +1560,18 @@
.. seealso::
`pytz <http://pypi.python.org/pypi/pytz/>`_
- The Standard Library has no :class:`tzinfo` instances except for UTC, but
- it exists a third-party library which brings Olson timezone database to
- Python: `pytz`.
+ The standard library has no :class:`tzinfo` instances except for UTC, but
+ there exists a third-party library which brings the *IANA timezone
+ database* (also known as the Olson database) to Python: *pytz*.
- `pytz` contains up-to-date information and its usage is recommended.
+ *pytz* contains up-to-date information and its usage is recommended.
+
+ `IANA timezone database <http://www.iana.org/time-zones>`_
+ The Time Zone Database (often called tz or zoneinfo) contains code and
+ data that represent the history of local time for many representative
+ locations around the globe. It is updated periodically to reflect changes
+ made by political bodies to time zone boundaries, UTC offsets, and
+ daylight-saving rules.
.. _datetime-timezone: