diff --git a/HISTORY.md b/HISTORY.md
index c82a692b3..046cfc47c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+Fri Jun 12 11:37:41 2015  Aaron Patterson <tenderlove@ruby-lang.org>
+
+	* Prevent extremely deep parameters from being parsed. CVE-2015-3225
+
 ### December 18th, Thirty sixth public release 1.6.0
   - See the [git history](https://github.com/rack/rack/compare/1.5.2...1.6.0)