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diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
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+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,30 @@
+## Rails 5.1.0.beta1 (February 23, 2017) ##
+
+*   Add `:args` to `process.action_mailer` event.
+
+    *Yuji Yaginuma*
+
+*   Add parameterized invocation of mailers as a way to share before filters and defaults between actions.
+    See `ActionMailer::Parameterized` for a full example of the benefit.
+
+    *DHH*
+
+*   Allow lambdas to be used as lazy defaults in addition to procs.
+
+    *DHH*
+
+*   Mime type: allow to custom content type when setting body in headers
+    and attachments.
+
+    Example:
+
+        def test_emails
+          attachments["invoice.pdf"] = "This is test File content"
+          mail(body: "Hello there", content_type: "text/html")
+        end
+
+    *Minh Quy*
+
 *   Exception handling: use `rescue_from` to handle exceptions raised by
     mailer actions, by message delivery, and by deferred delivery jobs.