diff --git a/README.md b/README.md
index a9ea12427..a4c56103a 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,13 @@ To run the tests.
 
 # Changelog
 
+## 2.1.8
+
+**Date**: 8th Dec 2012
+
+* Fix for creating nullable Foreign Keys with `''` as well as `None`.
+* Added `null=<bool>` related field option.
+
 ## 2.1.7
 
 **Date**: 7th Dec 2012
diff --git a/docs/api-guide/fields.md b/docs/api-guide/fields.md
index 1d4c34cb9..50a09701e 100644
--- a/docs/api-guide/fields.md
+++ b/docs/api-guide/fields.md
@@ -293,6 +293,7 @@ By default these fields are read-write, although you can change this behaviour u
 **Arguments**:
 
 * `queryset` - By default `ModelSerializer` classes will use the default queryset for the relationship.  `Serializer` classes must either set a queryset explicitly, or set `read_only=True`.
+* `null` - If set to `True`, the field will accept values of `None` or the emptystring for nullable relationships.
 
 ## SlugRelatedField / ManySlugRelatedField
 
@@ -304,6 +305,7 @@ By default these fields read-write, although you can change this behaviour using
 
 * `slug_field` - The field on the target that should be used to represent it.  This should be a field that uniquely identifies any given instance.  For example, `username`.
 * `queryset` - By default `ModelSerializer` classes will use the default queryset for the relationship.  `Serializer` classes must either set a queryset explicitly, or set `read_only=True`.
+* `null` - If set to `True`, the field will accept values of `None` or the emptystring for nullable relationships.
 
 ## HyperlinkedRelatedField / ManyHyperlinkedRelatedField
 
@@ -319,6 +321,7 @@ By default, `HyperlinkedRelatedField` is read-write, although you can change thi
 * `slug_field` - The field on the target that should be used for the lookup. Default is `'slug'`.
 * `pk_url_kwarg` - The named url parameter for the pk field lookup. Default is `pk`.
 * `slug_url_kwarg` - The named url parameter for the slug field lookup. Default is to use the same value as given for `slug_field`.
+* `null` - If set to `True`, the field will accept values of `None` or the emptystring for nullable relationships.
 
 ## HyperLinkedIdentityField
 
diff --git a/docs/topics/release-notes.md b/docs/topics/release-notes.md
index 5b371d01e..46eb1494d 100644
--- a/docs/topics/release-notes.md
+++ b/docs/topics/release-notes.md
@@ -4,6 +4,13 @@
 >
 > &mdash; Eric S. Raymond, [The Cathedral and the Bazaar][cite].
 
+## 2.1.8
+
+**Date**: 8th Dec 2012
+
+* Fix for creating nullable Foreign Keys with `''` as well as `None`.
+* Added `null=<bool>` related field option.
+
 ## 2.1.7
 
 **Date**: 7th Dec 2012
@@ -14,7 +21,7 @@
 * Added pickle support for serialized data.
 * Support `source='dotted.notation'` style for nested serializers.
 * Make `Request.user` settable.
-* Bugfix: Fix `RegexField` to work with `BrowsableAPIRenderer`
+* Bugfix: Fix `RegexField` to work with `BrowsableAPIRenderer`.
 
 ## 2.1.6
 
diff --git a/rest_framework/__init__.py b/rest_framework/__init__.py
index da2c5d5cb..02a606754 100644
--- a/rest_framework/__init__.py
+++ b/rest_framework/__init__.py
@@ -1,3 +1,3 @@
-__version__ = '2.1.7'
+__version__ = '2.1.8'
 
 VERSION = __version__  # synonym