diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 5e1d3fa8e0..8465462708 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -35,6 +35,7 @@ Changelog
  * Fix: The `wagtailfrontendcache` module's HTTP backend has been rewritten to reliably direct requests to the configured cache hostname
  * Fix: Resizing single pixel images with the "fill" filter no longer raises "ZeroDivisionError" or "tile cannot extend outside image"
  * Fix: The queryset returned from `search` operations when using the database search backend now correctly preserves additional properties of the original query, such as `prefetch_related` / `select_related`
+ * Fix: Responses from the external image URL generator are correctly marked as streaming and will no longer fail when used with Django's cache middleware
 
 
 1.0 (16.07.2015)
diff --git a/docs/releases/1.1.rst b/docs/releases/1.1.rst
index 1ec77917a6..a309377fdc 100644
--- a/docs/releases/1.1.rst
+++ b/docs/releases/1.1.rst
@@ -76,6 +76,7 @@ Bug fixes
  * The ``wagtailfrontendcache`` module's HTTP backend has been rewritten to reliably direct requests to the configured cache hostname
  * Resizing single pixel images with the "fill" filter no longer raises "ZeroDivisionError" or "tile cannot extend outside image"
  * The queryset returned from ``search`` operations when using the database search backend now correctly preserves additional properties of the original query, such as ``prefetch_related`` / ``select_related``
+ * Responses from the external image URL generator are correctly marked as streaming and will no longer fail when used with Django's cache middleware
 
 
 Upgrade considerations