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6 docs/ref/models/fields.txt
@@ -59,6 +59,9 @@ string, not ``NULL``.
coerced for string-based fields that have the empty string as a possible
value, and the value ``NULL`` will be stored to denote the empty string.
+If you want to accept :attr:`~Field.null` values with :class:`BooleanField`,
+use :class:`NullBooleanField` instead.
+
``blank``
---------
@@ -341,6 +344,9 @@ A true/false field.
The admin represents this as a checkbox.
+If you need to accept :attr:`~Field.null` values then use
+:class:`NullBooleanField` instead.
+
.. versionchanged:: 1.2
In previous versions of Django when running under MySQL ``BooleanFields``

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