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diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 4e8e0f41b4..de9722c392 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,23 @@
+*   Deprecate implicit Array conversion for Response objects. It was added
+    (using `#to_ary`) so we could conveniently use implicit splatting:
+
+        status, headers, body = response
+
+    But it also means `response + response` works and `[response].flatten`
+    cascades down to the Rack body. Nonsense behavior. Instead, rely on
+    explicit conversion and splatting with `#to_a`:
+
+        status, header, body = *response
+
+    *Jeremy Kemper*
+
+*   Don't rescue `IPAddr::InvalidAddressError`.
+
+    `IPAddr::InvalidAddressError` does not exist in Ruby 1.9.3
+    and fails for JRuby in 1.9 mode.
+
+    *Peter Suschlik*
+
 *   Fix bug where the router would ignore any constraints added to redirect
     routes.