diff --git a/README.getsentry.md b/README.getsentry.md
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@@ -0,0 +1,20 @@
+# Sentry Modifications
+
+This is a fork of [Google Breakpad](https://chromium.googlesource.com/breakpad/breakpad/) maintained by Sentry for use in `sentry-native`.
+
+## Modifications
+
+- **Windows**: Dynamically size minidump paths instead of using `MAX_PATH` constant.
+- **Windows**: Xbox One build support.
+- **Linux**: Cast `SIGSTKSZ` to int for compatibility with glibc 2.34+ (where it's no longer a compile-time constant).
+- **Build System**: CMake integration (see below).
+- **macOS**: Extend the handler callback with a user-context (containing register state of the crash site) for x86_64 and arm64.
+- **C++17 standard requirement**: upstream uses C++20 (or newer).
+
+## Build System Changes
+
+To minimize external dependencies and better integrate with `sentry-native`, this fork uses CMake instead of Breakpad's native Autotools/`configure` build system.
+
+The CMake build files are maintained in the parent [`sentry-native` repository](https://github.com/getsentry/sentry-native):
+
+- [`../../CMakeLists.txt`](https://github.com/getsentry/sentry-native/blob/master/CMakeLists.txt) - Defines the `breakpad_client` target and lists all source files
diff --git a/README.md b/README.md
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+++ b/README.md
@@ -80,3 +80,8 @@ dependent repos are up-to-date.
     click on it, then “Add reviewer”, and enter in the code reviewer. Depending
     on your settings, you may not see an email, but the reviewer has been
     notified with google-breakpad-dev@googlegroups.com always CC’d.
+
+## Sentry modifications
+
+See [README.getsentry.md](README.getsentry.md) for more information on the
+changes, and on maintaining the fork.