diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index b6df8da..ad6c01d 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -4,6 +4,8 @@
 
 Marking posts and replies as sensitive content is now possible.
 
+Much more aggresive HTML sanitization.
+
 **disabled by now** On OpenBSD, use the `unveil()` function.
 
 ## 2.10