diff --git a/README.md b/README.md
index 102637744..c06432927 100644
--- a/README.md
+++ b/README.md
@@ -373,7 +373,7 @@ Tests](https://web-platform-tests.org/).
 We use [a fork](https://github.com/lightpanda-io/wpt/tree/fork) including a custom
 [`testharnessreport.js`](https://github.com/lightpanda-io/wpt/blob/fork/resources/testharnessreport.js). Results are [published](https://perf.lightpanda.io/wpt) daily.
 
-For reference, you can easily execute a WPT test case with your browser via
+For reference, you can execute a WPT test case with your browser via
 [wpt.live](https://wpt.live).
 
 #### Configure WPT HTTP server
@@ -416,7 +416,14 @@ First start the WPT's HTTP server from your `wpt/` clone dir.
 Run a Lightpanda browser
 
 ```
-zig build run -- --insecure-disable-tls-host-verification
+zig build -Dwpt_extensions run -- serve \
+    --ws-max-concurrent 64 \
+    --insecure-disable-tls-host-verification \
+    --load-resources iframe \
+    --load-resources image \
+    --load-resources worker \
+    --load-resources stylesheet \
+    --experimental-features cors
 ```
 
 Then you can start the wptrunner from the demo's clone dir:
@@ -437,7 +444,7 @@ Also `--concurrency` define the concurrency limit.
 it's useful to build in `releaseFast` mode to make tests faster.
 
 ```
-zig build -Doptimize=ReleaseFast run
+zig build -Dwpt_extensions -Doptimize=ReleaseFast run -- serve ...
 ```
 
 ## Contributing