diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 371a7c3488..3539965c14 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -11,6 +11,7 @@ Changelog
  * 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)
  * Added optional directory argument to "wagtail start" command (Mitchel Cabuloy)
+ * Image file size is now stored in the database, to avoid unnecessary filesystem lookups
  * 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 fc8fbd8222..2e29fc3d66 100644
--- a/docs/releases/1.1.rst
+++ b/docs/releases/1.1.rst
@@ -24,6 +24,7 @@ Minor features
  * 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
  * Added optional directory argument to "wagtail start" command
+ * Image file size is now stored in the database, to avoid unnecessary filesystem lookups
 
 Bug fixes
 ~~~~~~~~~