diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 845282029..61aea034c 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -9,6 +9,7 @@ Changelog
  * The `{% image %}` tag now supports filters on the image variable, e.g. `{% image primary_img|default:secondary_img width-500 %}`
  * Moved the style guide menu item into the Settings sub-menu
  * Search backends can now be specified by module (e.g. `wagtail.wagtailsearch.backends.elasticsearch`), rather than a specific class (`wagtail.wagtailsearch.backends.elasticsearch.ElasticSearch`)
+ * Added ``descendant_of`` filter to the API (Michael Fillier)
  * Fix: Text areas in the non-default tab of the page editor now resize to the correct height
 
 
diff --git a/docs/releases/1.1.rst b/docs/releases/1.1.rst
index c1c537cb8..dab9b3b1d 100644
--- a/docs/releases/1.1.rst
+++ b/docs/releases/1.1.rst
@@ -22,3 +22,4 @@ Minor features
  * The ``{% image %}`` tag now supports filters on the image variable, e.g. ``{% image primary_img|default:secondary_img width-500 %}``
  * Moved the style guide menu item into the Settings sub-menu
  * Search backends can now be specified by module (e.g. ``wagtail.wagtailsearch.backends.elasticsearch``), rather than a specific class (``wagtail.wagtailsearch.backends.elasticsearch.ElasticSearch``)
+ * Added ``descendant_of`` filter to the API