registers these changes in the CHANGELOGs

activesupport/CHANGELOG.md

@@ -1,3 +1,14 @@
+*   Implements an evented file system monitor to asynchronously detect changes
+    in the application source code, routes, locales, etc.
+
+    To opt-in load the [listen](https://github.com/guard/listen) gem in `Gemfile`:
+
+      group :development do
+        gem 'listen', '~> 3.0.4'
+      end
+
+    *Puneet Agarwal* and *Xavier Noria*
+
 * Updated `parameterize` to preserve the case of a string, optionally.
 
     Example:

railties/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   Generated `Gemfile`s for new applications include a new dependency on
+    [listen](https://github.com/guard/listen) commented out.
+
+    *Puneet Agarwal* and *Xavier Noria*
+
 *   Deprecate `serve_static_files` in favor of `public_file_server.enabled`.
 
     Unifies the static asset options under `public_file_server`.