diff --git a/docs/ref/models/fields.txt b/docs/ref/models/fields.txt
index 612949ab4a..35e0a2a094 100644
--- a/docs/ref/models/fields.txt
+++ b/docs/ref/models/fields.txt
@@ -479,6 +479,8 @@ For fields like :class:`ForeignKey` that map to model instances, defaults
 should be the value of the field they reference (``pk`` unless
 :attr:`~ForeignKey.to_field` is set) instead of model instances.
 
+For a :class:`ManyToManyField`, the default is not used when saving the object. 
+
 The default value is used when new model instances are created and a value
 isn't provided for the field. When the field is a primary key, the default is
 also used when the field is set to ``None``.