diff --git a/src/content/release/breaking-changes/index.md b/src/content/release/breaking-changes/index.md
index 729a213ef17..3242bd47a7d 100644
--- a/src/content/release/breaking-changes/index.md
+++ b/src/content/release/breaking-changes/index.md
@@ -50,6 +50,7 @@ They're sorted by release and listed in alphabetical order:
 * [`$FLUTTER_ROOT/version` replaced by `$FLUTTER_ROOT/bin/cache/flutter.version.json`][]
 * [SnackBar with action no longer auto-dismisses][]
 * [Deprecate `SemanticsProperties.focusable` and `SemanticsConfiguration.isFocusable`][]
+* [Merged threads on Linux][]
 
 [Deprecate `OverlayPortal.targetsRootOverlay`]: /release/breaking-changes/deprecate-overlay-portal-targets-root
 [Deprecate `TextField.canRequestFocus`]: /release/breaking-changes/can-request-focus
@@ -59,6 +60,7 @@ They're sorted by release and listed in alphabetical order:
 [`$FLUTTER_ROOT/version` replaced by `$FLUTTER_ROOT/bin/cache/flutter.version.json`]: /release/breaking-changes/flutter-root-version-file
 [SnackBar with action no longer auto-dismisses]: /release/breaking-changes/snackbar-with-action-behavior-update
 [Deprecate `SemanticsProperties.focusable` and `SemanticsConfiguration.isFocusable`]: /release/breaking-changes/deprecate-focusable
+[Merged threads on Linux]: /release/breaking-changes/linux-merged-threads
 
 <a id="released-in-flutter-335" aria-hidden="true"></a>
 ### Released in Flutter 3.35
diff --git a/src/content/release/breaking-changes/linux-merged-threads.md b/src/content/release/breaking-changes/linux-merged-threads.md
new file mode 100644
index 00000000000..116ea2d3d55
--- /dev/null
+++ b/src/content/release/breaking-changes/linux-merged-threads.md
@@ -0,0 +1,50 @@
+---
+title: Merged threads on Linux
+description: >-
+  Learn about threading changes on Linux in Flutter FIXME:RELEASE_VERSION
+---
+
+## Summary
+
+Flutter FIXME:RELEASE_VERSION merges the UI and platform threads by default on Linux.
+
+## Context
+
+Originally, Flutter had separate threads to produce UI frames and to
+interact with the native platform.
+
+The split-thread design prevented Flutter apps and plugins from using Dart FFI
+to interoperate with native APIs that must be called on the platform thread.
+
+## Description of change
+
+Flutter FIXME:Next version merges the UI and platform threads by default on Linux.
+
+This mirrors all the other platforms, whose threads were merged by default in
+Flutter 3.29 (iOS and Android) and 3.35 (macOS and Windows).
+
+## Migration guide
+
+Merged threads should not affect your app.
+
+If you suspect merged threads has regressed your app, please reach out on
+[Issue 150525][].
+
+## Timeline
+
+Landed in version: FIXME:LANDED_VERSION<br>
+In stable release: FIXME:RELEASE_VERSION
+
+## References
+
+Relevant issue:
+
+* [Issue 150525][]
+
+Relevant PRs:
+
+* [PR 176759][]
+
+[Issue 150525]: {{site.repo.flutter}}/issues/150525
+[PR 176759]: {{site.repo.flutter}}/pull/176759
+