diff --git a/boltons/timeutils.py b/boltons/timeutils.py
index 4aa5112..586f967 100644
--- a/boltons/timeutils.py
+++ b/boltons/timeutils.py
@@ -15,9 +15,10 @@ The following module defines usable forms of the timezones in those
 docs, as well as a couple other useful ones, :data:`UTC` (aka GMT) and
 :data:`LocalTZ` (representing the local timezone as configured in the
 operating system). For timezones beyond these, as well as a higher
-degree of accuracy in corner cases, check out `pytz`_.
+degree of accuracy in corner cases, check out `pytz`_ and `dateutil`_.
 
 .. _pytz: https://pypi.python.org/pypi/pytz
+.. _dateutil: https://dateutil.readthedocs.io/en/stable/index.html
 """
 
 import re
diff --git a/docs/timeutils.rst b/docs/timeutils.rst
index db3d49d..090c28c 100644
--- a/docs/timeutils.rst
+++ b/docs/timeutils.rst
@@ -38,8 +38,9 @@ US timezones
 
 These four US timezones were implemented in the :mod:`datetime`
 documentation and have been reproduced here in boltons for
-convenience. More in-depth support is provided by `pytz`_.
+convenience. More in-depth support is provided by `dateutil`_ and `pytz`_.
 
+.. _dateutil: https://dateutil.readthedocs.io/en/stable/index.html
 .. _pytz: https://pypi.python.org/pypi/pytz
 
 .. autoattribute:: boltons.timeutils.Eastern