diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index b56c015cca..e80ac6a126 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -62,6 +62,7 @@ Changelog
  * Fix: Remove use of Node.forEach for IE 11 compatibility in admin menu items (Thibaud Colas)
  * Fix: Fix incorrect method name in SiteMiddleware deprecation warning (LB (Ben Johnston))
  * Fix: `wagtail.contrib.sitemaps` no longer depends on SiteMiddleware (Matt Westcott)
+ * Fix: Purge image renditions cache when renditions are deleted (Pascal Widdershoven, Matt Westcott)
 
 
 2.9.1 (30.06.2020)
diff --git a/docs/releases/2.10.rst b/docs/releases/2.10.rst
index bb8c7498c4..845e7d3fa2 100644
--- a/docs/releases/2.10.rst
+++ b/docs/releases/2.10.rst
@@ -85,6 +85,7 @@ Bug fixes
  * Remove use of Node.forEach for IE 11 compatibility in admin menu items (Thibaud Colas)
  * Fix incorrect method name in SiteMiddleware deprecation warning (LB (Ben Johnston))
  * ``wagtail.contrib.sitemaps`` no longer depends on SiteMiddleware (Matt Westcott)
+ * Purge image renditions cache when renditions are deleted (Pascal Widdershoven, Matt Westcott)
 
 
 Upgrade considerations