diff --git a/docs/ref/forms/fields.txt b/docs/ref/forms/fields.txt
index c8b8044d26a..03898e60ea7 100644
--- a/docs/ref/forms/fields.txt
+++ b/docs/ref/forms/fields.txt
@@ -467,6 +467,10 @@ For each field, we describe the default widget used if you don't specify
     The ``max_value`` and ``min_value`` error messages may contain
     ``%(limit_value)s``, which will be substituted by the appropriate limit.
 
+    .. versionchanged:: 1.6
+        Similarly, the ``max_digits``, ``max_decimal_places`` and
+        ``max_whole_digits`` error messages may contain ``%(max)s``.
+
     Takes four optional arguments:
 
     .. attribute:: max_value
@@ -1013,6 +1017,11 @@ objects (in the case of ``ModelMultipleChoiceField``) into the
         The empty and normalized values were changed to be consistently
         ``QuerySets`` instead of ``[]`` and ``QuerySet`` respectively.
 
+    .. versionchanged:: 1.6
+        The ``invalid_choice`` message may contain ``%(value)s`` and the
+        ``invalid_pk_value`` message may contain ``%(pk)s``, which will be
+        substituted by the appropriate values.
+
     Allows the selection of one or more model objects, suitable for
     representing a many-to-many relation. As with :class:`ModelChoiceField`,
     you can use ``label_from_instance`` to customize the object
diff --git a/docs/releases/1.6.txt b/docs/releases/1.6.txt
index 2f06756a1bf..3e15f5b7671 100644
--- a/docs/releases/1.6.txt
+++ b/docs/releases/1.6.txt
@@ -423,6 +423,13 @@ Miscellaneous
   ``type='email'``, ``type='url'`` or ``type='number'`` depending on their
   corresponding field type.
 
+* Form field's :attr:`~django.forms.Field.error_messages` that contain a
+  placeholder should now always use a named placeholder (``"Value '%(value)s' is
+  too big"`` instead of ``"Value '%s' is too big"``). See the corresponding
+  field documentation for details about the names of the placeholders. The
+  changes in 1.6 particularly affect :class:`~django.forms.DecimalField` and
+  :class:`~django.forms.ModelMultipleChoiceField`.
+
 Features deprecated in 1.6
 ==========================