diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 911c916028..b63fb4a9b6 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -91,7 +91,7 @@
 
     *Andrew White*
 
-*   Show full route constraints in error message
+*   Show full route constraints in error message.
 
     When an optimized helper fails to generate, show the full route constraints
     in the error message. Previously it would only show the contraints that were
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index f1d51b9de1..e06ed5764e 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -59,14 +59,16 @@
     *Lauro Caetano*
 
 *   Fix regressions on `select_*` methods.
-    When `select_*` methods receive a `Relation` object, they should be able to get the arel/binds from it.
+    When `select_*` methods receive a `Relation` object, they should be able to
+    get the arel/binds from it.
     Also fix regressions on `select_rows` that was ignoring the binds.
 
     Fixes #7538, #12017, #13731, #12056.
 
     *arthurnn*
 
-*   Active Record objects can now be correctly dumped, loaded and dumped again without issues.
+*   Active Record objects can now be correctly dumped, loaded and dumped again
+    without issues.
 
     Previously, if you did `YAML.dump`, `YAML.load` and then `YAML.dump` again
     in an Active Record model that used serialization it would fail at the last
@@ -154,12 +156,14 @@
 
     *Rafael Mendonça França*
 
-*   `has_one` and `belongs_to` accessors don't add ORDER BY to the queries anymore.
+*   `has_one` and `belongs_to` accessors don't add ORDER BY to the queries
+    anymore.
 
-    Since Rails 4.0, we add an ORDER BY in the `first` method to ensure consistent results
-    among different database engines. But for singular associations this behavior is not needed
-    since we will have one record to return. As this ORDER BY option can lead some performance
-    issues we are removing it for singular associations accessors.
+    Since Rails 4.0, we add an ORDER BY in the `first` method to ensure
+    consistent results among different database engines. But for singular
+    associations this behavior is not needed since we will have one record to
+    return. As this ORDER BY option can lead some performance issues we are
+    removing it for singular associations accessors.
 
     Fixes #12623.
 
@@ -227,7 +231,7 @@
 
     *Harry Brundage*
 
-*   Enable partial indexes for sqlite >= 3.8.0
+*   Enable partial indexes for `sqlite >= 3.8.0`.
 
     See http://www.sqlite.org/partialindex.html
 
@@ -355,7 +359,7 @@
     This ensures that `change_table` and `create_table` will use
     similar objects.
 
-    Fixes #13577 and #13503.
+    Fixes #13577, #13503.
 
     *Nishant Modak*, *Prathamesh Sonpatki*, *Rafael Mendonça França*
 
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 0dc74ecd8c..9a62bd5a77 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -12,7 +12,7 @@
 
     *Hincu Petru*
 
-*   Deprecate custom `BigDecimal` serialization
+*   Deprecate custom `BigDecimal` serialization.
 
     Deprecate the custom `BigDecimal` serialization that is included when requiring
     `active_support/all` as a fix for #12467. Let Ruby handle YAML serialization
@@ -76,7 +76,8 @@
 
     *Andrew White*
 
-*   Added `Hash#compact` and `Hash#compact!` for removing items with nil value from hash.
+*   Added `Hash#compact` and `Hash#compact!` for removing items with nil value
+    from hash.
 
     *Celestino Gomes*
 
diff --git a/guides/source/4_1_release_notes.md b/guides/source/4_1_release_notes.md
index 4e75bf400c..170b071df8 100644
--- a/guides/source/4_1_release_notes.md
+++ b/guides/source/4_1_release_notes.md
@@ -175,6 +175,8 @@ conversation.active? # => false
 conversation.status  # => "archived"
 
 Conversation.archived # => Relation for all archived Conversations
+
+Conversation.statuses # => { "active" => 0, "archived" => 1 }
 ```
 
 See its
@@ -241,6 +243,7 @@ unless they use `xhr`. Upgrade your tests to be explicit about expecting
 XmlHttpRequests. Instead of `post :create, format: :js`, switch to the explicit
 `xhr :post, :create, format: :js`.
 
+
 Railties
 --------
 
@@ -278,7 +281,7 @@ for detailed changes.
 * Exposed `MiddlewareStack#unshift` to environment
   configuration. ([Pull Request](https://github.com/rails/rails/pull/12479))
 
-* Add `Application#message_verifier` method to return a message
+* Added `Application#message_verifier` method to return a message
   verifier. ([Pull Request](https://github.com/rails/rails/pull/12995))
 
 * The `test_help.rb` file which is required by the default generated test
@@ -288,6 +291,7 @@ for detailed changes.
   with `config.active_record.maintain_test_schema = false`. ([Pull
   Request](https://github.com/rails/rails/pull/13528))
 
+
 Action Pack
 -----------
 
@@ -335,6 +339,18 @@ for detailed changes.
 * Separated Action View completely from Action
   Pack. ([Pull Request](https://github.com/rails/rails/pull/11032))
 
+* Log which keys were affected by deep
+  munge. ([Pull Request](https://github.com/rails/rails/pull/13813))
+
+* New config option `config.action_dispatch.perform_deep_munge` to opt out of
+  params "deep munging" that was used to address security vulnerability
+  CVE-2013-0155. ([Pull Request](https://github.com/rails/rails/pull/13188))
+
+* Added `:serializer` option for `config.session_store :cookie_store`. This
+  changes default serializer when using
+  `:cookie_store`. ([Pull Request](https://github.com/rails/rails/pull/13692))
+
+
 Action Mailer
 -------------
 
@@ -344,9 +360,13 @@ for detailed changes.
 
 ### Notable changes
 
+* Added mailer previews feature based on 37 Signals mail_view
+  gem. ([Commit](https://github.com/rails/rails/commit/d6dec7fcb6b8fddf8c170182d4fe64ecfc7b2261))
+
 * Instrument the generation of Action Mailer messages. The time it takes to
   generate a message is written to the log. ([Pull Request](https://github.com/rails/rails/pull/12556))
 
+
 Active Record
 -------------
 
@@ -495,11 +515,32 @@ for detailed changes.
   object. Helper methods used by multiple fixtures should be defined on modules
   included in `ActiveRecord::FixtureSet.context_class`. ([Pull Request](https://github.com/rails/rails/pull/13022))
 
-* Don't create or drop the test database if RAILS_ENV is specified explicitly.
+* Don't create or drop the test database if RAILS_ENV is specified
+  explicitly. ([Pull Request](https://github.com/rails/rails/pull/13629))
 
 * `Relation` no longer has mutator methods like `#map!` and `#delete_if`. Convert
   to an `Array` by calling `#to_a` before using these methods. ([Pull Request](https://github.com/rails/rails/pull/13314))
 
+* `find_in_batches`, `find_each`, `Result#each` and `Enumerable#index_by` now
+  return an `Enumerator` that can calculate its
+  size. ([Pull Request](https://github.com/rails/rails/pull/13938))
+
+* `scope` and `endum` now raise on "dangerous" name
+  conflicts. ([Pull Request](https://github.com/rails/rails/pull/13450))
+
+* `second` through `fifth` methods act like the `first`
+  finder. ([Pull Request](https://github.com/rails/rails/pull/13757))
+
+* Make `touch` fire the `after_commit` and `after_rollback`
+  callbacks. ([Pull Request](https://github.com/rails/rails/pull/12031))
+
+* Enable partial indexes for `sqlite >=
+  3.8.0`. ([Pull Request](https://github.com/rails/rails/pull/13350))
+
+* Make `change_column_null`
+  revertable. ([Commit](https://github.com/rails/rails/commit/724509a9d5322ff502aefa90dd282ba33a281a96))
+
+
 Active Model
 ------------
 
@@ -517,6 +558,13 @@ for detailed changes.
 * Added new API methods `reset_changes` and `changes_applied` to
   `ActiveModel::Dirty` that control changes state.
 
+* Ability to specify multiple contexts when defining a
+  validation. ([Pull Request](https://github.com/rails/rails/pull/13754))
+
+* `attribute_changed?` now accepts a hash to check if the attribute was changed
+  `:from` and/or `:to` a given
+  value. ([Pull Request](https://github.com/rails/rails/pull/13131))
+
 
 Active Support
 --------------
@@ -570,6 +618,9 @@ for detailed changes.
 * Remove deprecated `#filter` method for filter objects, use the corresponding
   method instead (e.g. `#before` for a before filter).
 
+* Removed 'cow' => 'kine' irregular inflection from default
+  inflections. ([Commit](https://github.com/rails/rails/commit/c300dca9963bda78b8f358dbcb59cabcdc5e1dc9))
+
 ### Deprecations
 
 * Deprecated `Numeric#{ago,until,since,from_now}`, the user is expected to
@@ -591,6 +642,9 @@ for detailed changes.
   ([Pull Request](https://github.com/rails/rails/pull/13060) /
   [More Details](upgrading_ruby_on_rails.html#changes-in-json-handling))
 
+* Deprecate custom `BigDecimal`
+  serialization. ([Pull Request](https://github.com/rails/rails/pull/13911))
+
 ### Notable changes
 
 * `ActiveSupport`'s JSON encoder has been rewritten to take advantage of the
@@ -620,11 +674,30 @@ for detailed changes.
   `at_middle_of_day` as
   aliases. ([Pull Request](https://github.com/rails/rails/pull/10879))
 
+* Added `Date#all_week/month/quarter/year` for generating date
+  ranges. ([Pull Request](https://github.com/rails/rails/pull/9685))
+
+* Added `Time.zone.yesterday` and
+  `Time.zone.tomorrow`. ([Pull Request](https://github.com/rails/rails/pull/12822))
+
 * Added `String#remove(pattern)` as a short-hand for the common pattern of
   `String#gsub(pattern,'')`. ([Commit](https://github.com/rails/rails/commit/5da23a3f921f0a4a3139495d2779ab0d3bd4cb5f))
 
-* Removed 'cow' => 'kine' irregular inflection from default
-  inflections. ([Commit](https://github.com/rails/rails/commit/c300dca9963bda78b8f358dbcb59cabcdc5e1dc9))
+* Added `Hash#compact` and `Hash#compact!` for removing items with nil value
+  from hash. ([Pull Request](https://github.com/rails/rails/pull/13632))
+
+* `blank?` and `present?` commit to return
+  singletons. ([Commit](https://github.com/rails/rails/commit/126dc47665c65cd129967cbd8a5926dddd0aa514))
+
+* Default the new `I18n.enforce_available_locales` config to `true`, meaning
+  `I18n` will make sure that all locales passed to it must be declared in the
+  `available_locales`
+  list. ([Pull Request](https://github.com/rails/rails/commit/8e21ae37ad9fef6b7393a84f9b5f2e18a831e49a))
+
+* Introduce Module#concerning: a natural, low-ceremony way to separate
+  responsibilities within a
+  class. ([Commit](https://github.com/rails/rails/commit/1eee0ca6de975b42524105a59e0521d18b38ab81))
+
 
 Credits
 -------
diff --git a/railties/CHANGELOG.md b/railties/CHANGELOG.md
index 4ac6a99662..5ea025924b 100644
--- a/railties/CHANGELOG.md
+++ b/railties/CHANGELOG.md
@@ -1,6 +1,6 @@
 *   Added Thor-action for creation of migrations.
 
-    Fixes #13588 and #12674.
+    Fixes #13588, #12674.
 
     *Gert Goet*