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diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 66b7365916..be1862279c 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,5 +1,26 @@
 ## Rails 6.0.0.alpha (Unreleased) ##
 
+*   Add `private: true` option to ActiveSupport's `delegate`.
+
+    In order to delegate methods as private methods:
+
+        class User < ActiveRecord::Base
+          has_one :profile
+          delegate :date_of_birth, to: :profile, private: true
+
+          def age
+            Date.today.year - date_of_birth.year
+          end
+        end
+
+        # User.new.age  # => 29
+        # User.new.date_of_birth
+        # => NoMethodError: private method `date_of_birth' called for #<User:0x00000008221340>
+
+    More information in #31944.
+
+    *Tomas Valent*
+
 *   `String#truncate_bytes` to truncate a string to a maximum bytesize without
     breaking multibyte characters or grapheme clusters like 👩‍👩‍👦‍👦.