Provide docs.

docs/api.txt

@@ -4,7 +4,13 @@ The API
 After you've got your ``TaggableManager`` added to your model you can start
 playing around with the API.
 
-.. class:: TaggableManager
+.. class:: TaggableManager([verbose_name="Tags", help_text="A comma-separated list of tags.", through=None, blank=False])
+    
+    :param verbose_name: The verbose_name for this field.
+    :param help_text: The help_text to be used in forms (including the admin).
+    :param through: The through model, see :doc:`custom_tagging` for more
+        information.
+    :param blank: Controls whether this field is required.
 
     .. method:: add(*tags)
 

docs/changelog.txt

 Changelog
 =========
 
+1.0.0
+~~~~~
+
+Unreleased.
+
+ * *Backwards incompatible*  Forms containing a :class:`TaggableManager` by
+   default now require tags, to change this provide ``blank=True`` to the
+   :class:`TaggableManager`.
+
+
+
 0.9.0
 ~~~~~
 

taggit/managers.py

@@ -36,13 +36,13 @@ class TaggableRel(ManyToManyRel):
 
 
 class TaggableManager(RelatedField):
-    def __init__(self, verbose_name=_("Tags"), help_text=None, through=None,
-        blank=False):
+    def __init__(self, verbose_name=_("Tags"),
+        help_text=_("A comma-separated list of tags."), through=None, blank=False):
         self.use_gfk = through is None or issubclass(through, GenericTaggedItemBase)
         self.through = through or TaggedItem
         self.rel = TaggableRel(to=self.through._meta.get_field("tag").rel.to)
         self.verbose_name = verbose_name
-        self.help_text = help_text or _("A comma-separated list of tags.")
+        self.help_text = help_text
         self.blank = blank
         self.editable = True
         self.unique = False