diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 87cb99d186..68cbd6c292 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -5,6 +5,7 @@ Changelog
 ~~~~~~~~~~~~~~~~
 
  * Django 1.9 support
+ * Support for indexing fields across relations in Elasticsearch
  * Added `WAGTAIL_PASSWORD_RESET_ENABLED` setting to allow password resets to be disabled independently of the password management interface (John Draper)
  * Updated fonts for more comprehensive Unicode support
  * Added `.alt` attribute to image renditions
diff --git a/docs/releases/1.3.rst b/docs/releases/1.3.rst
index 048bf7e8b3..b8cd86ef81 100644
--- a/docs/releases/1.3.rst
+++ b/docs/releases/1.3.rst
@@ -16,6 +16,33 @@ Django 1.9 support
 Wagtail is now compatible with Django 1.9.
 
 
+Indexing fields across relations in Elasticsearch
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Fields on related objects can now be indexed in Elasticsearch using the new ``indexed.RelatedFields`` declaration type:
+
+.. code-block:: python
+
+    class Book(models.Model, indexed.Indexed):
+        ...
+
+        search_fields = [
+            indexed.SearchField('title'),
+            indexed.FilterField('published_date'),
+
+            indexed.RelatedFields('author', [
+                indexed.SearchField('name'),
+                indexed.FilterField('date_of_birth'),
+            ]),
+        ]
+
+    # Search books where their author was born after 1950
+    # Both the book title and the authors name will be searched
+    >>> Book.objects.filter(author__date_of_birth__gt=date(1950, 1, 1)).search("Hello")
+
+See: :ref:`wagtailsearch_index_relatedfields`
+
+
 Minor features
 ~~~~~~~~~~~~~~
 
diff --git a/docs/topics/search/indexing.rst b/docs/topics/search/indexing.rst
index 9a33456cea..847b30a8e8 100644
--- a/docs/topics/search/indexing.rst
+++ b/docs/topics/search/indexing.rst
@@ -111,6 +111,8 @@ Options
 These are added to the search index but are not used for full-text searches. Instead, they allow you to run filters on your search results.
 
 
+.. _wagtailsearch_index_relatedfields:
+
 ``index.RelatedFields``
 -----------------------