diff --git a/changelog.d/704.doc.rst b/changelog.d/704.doc.rst
new file mode 100644
index 0000000..1568b69
--- /dev/null
+++ b/changelog.d/704.doc.rst
@@ -0,0 +1 @@
+Added documentation for ``dateutil.tz.gettz``. Reported by @pganssle (gh issue #647). Fixed by @weatherpattern (gh pr #704)
diff --git a/dateutil/tz/tz.py b/dateutil/tz/tz.py
index 3a2c4d5..b243be2 100644
--- a/dateutil/tz/tz.py
+++ b/dateutil/tz/tz.py
@@ -190,8 +190,6 @@
 class tzlocal(_tzinfo):
     """
     A :class:`tzinfo` subclass built around the ``time`` timezone functions.
-
-
     """
     def __init__(self):
         super(tzlocal, self).__init__()
@@ -1460,6 +1458,50 @@
         tzlocal_classes += (tzwinlocal,)
 
     class GettzFunc(object):
+        """gettz(name=None)
+
+        Given a variety of inputs, like time zone name and ``TZ`` varible,
+        return the tz (aka Olson) database time zone.
+
+        :param name:
+            A time zone name, a ``TZ`` variable, or ``None``.
+
+        :return:
+            A :class:`dateutil.tz.tzfile`. If name is ``None``,
+            the ``tzfile`` localtime is returned. 
+
+        **Examples:**
+
+        You can get the local time.
+
+        .. code-block:: python
+
+            >>> gettz()
+            tzfile('/etc/localtime')
+
+        You can parse time zone names.
+
+        .. code-block:: python
+
+            >>> gettz('Pacific/Kiritimati')
+            tzfile('/usr/share/zoneinfo/Pacific/Kiritimati')
+
+        You can parse a ``TZ`` variable.
+
+        .. code-block:: python
+
+            >>> gettz('AEST-10AEDT-11,M10.1.0/2,M4.1.0/3')
+            tzstr('AEST-10AEDT-11,M10.1.0/2,M4.1.0/3')
+        
+        Calling with the same name will return the same object.
+
+        .. code-block:: python
+
+            >>> tz.gettz('Pacific/Kiritimati') is tz.gettz('Pacific/Kiritimati')
+            True
+
+
+        """
         def __init__(self):
 
             self.__instances = weakref.WeakValueDictionary()
diff --git a/docs/tz.rst b/docs/tz.rst
index 5fd5bf5..0dca230 100644
--- a/docs/tz.rst
+++ b/docs/tz.rst
@@ -4,3 +4,5 @@
 .. automodule:: dateutil.tz
    :members:
    :undoc-members:
+
+.. automethod:: dateutil.tz.gettz
\ No newline at end of file