diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ebcabc8a27..e367e3fa62 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,6 +26,16 @@ npm run watch
 npx playwright install
 ```
 
+**Experimental watch mode for recorder/trace-viewer/UI Mode**
+
+```
+PW_HMR=1 npm run watch
+PW_HMR=1 npx playwright show-trace
+PW_HMR=1 npm run ctest -- --ui
+PW_HMR=1 npx playwright codegen
+PW_HMR=1 npx playwright show-report
+```
+
 Playwright is a multi-package repository that uses npm workspaces. For browser APIs, look at [`packages/playwright-core`](https://github.com/microsoft/playwright/blob/main/packages/playwright-core). For test runner, see [`packages/playwright`](https://github.com/microsoft/playwright/blob/main/packages/playwright).
 
 Note that some files are generated by the build, so the watch process might override your changes if done in the wrong file. For example, TypeScript types for the API are generated from the [`docs/src`](https://github.com/microsoft/playwright/blob/main/docs/src).