Ticket #4351: 4351.patch

docs/model-api.txt

@@ -464 +464 @@
 
 Note that empty string values will always get stored as empty strings, not
 as ``NULL`` -- so use ``null=True`` for non-string fields such as integers,
-booleans and dates.
+booleans and dates. Note that you will still need ``blank=True`` to if the
+field is allowed to be blank in Django's admin site.
 
 Avoid using ``null`` on string-based fields such as ``CharField`` and
 ``TextField`` unless you have an excellent reason. If a string-based field