diff --git a/CHANGELOG.md b/CHANGELOG.md
index d19cd8f..72d761d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,8 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
-- No changes yet.
+## 0.4.0 - 2024-04-03
+### Added
+- ([#150]) `--skip-generated` flag to skip running on files containing
+  generated code.
+
+  [#150]: https://github.com/uber-go/gopatch/pull/150
 
 ## 0.3.0 - 2023-07-14
 ### Added
diff --git a/README.md b/README.md
index 4aa36d9..45dc0ef 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ running the following command in your terminal and place it on your `$PATH`.
   [Releases page]: https://github.com/uber-go/gopatch/releases
 
 ```bash
-VERSION=0.3.0
+VERSION=0.4.0
 URL="https://github.com/uber-go/gopatch/releases/download/v$VERSION/gopatch_${VERSION}_$(uname -s)_$(uname -m).tar.gz"
 curl -L "$URL" | tar xzv gopatch
 ```
@@ -247,6 +247,16 @@ gopatch supports the following command line options.
     $ gopatch --skip-import-processing -p foo.patch -p bar.patch path/to/my/project
     ```
 
+- `--skip-generated`
+  
+  Flag to turn on skip-generated code mode. Provide this flag to skip running the
+  tool on generated code. A file is considered containing generated code if it 
+  has `@generated` or `^// Code generated .* DO NOT EDIT\.$` in the comment
+  header.
+    ```shell
+    $ gopatch --skip-generated -p foo.patch -p bar.patch path/to/my/project
+    ```
+
 # Patches
 
 Patch files are the input to gopatch that specify how to transform code. Each