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diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index f2229d61fb..bb15edee63 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,25 @@
+*   ActionDispatch::Response#new no longer applies default headers.  If you want
+    default headers applied to the response object, then call
+    `ActionDispatch::Response.create`.  This change only impacts people who are
+    directly constructing an `ActionDispatch::Response` object.
+
+*   Accessing mime types via constants like `Mime::HTML` is deprecated.  Please
+    change code like this:
+
+      Mime::HTML
+
+    To this:
+
+      Mime::Type[:HTML]
+
+    This change is so that Rails will not manage a list of constants, and fixes
+    an issue where if a type isn't registered you could possibly get the wrong
+    object.
+
+*   `url_for` does not modify its arguments when generating polymorphic URLs.
+
+    *Bernerd Schaefer*
+
 *   Make it easier to opt in to `config.force_ssl` and `config.ssl_options` by
     making them less dangerous to try and easier to disable.