adding comment
diff --git a/tests/run.mjs b/tests/run.mjs
index fe26ec0..8e33ebd 100644
--- a/tests/run.mjs
+++ b/tests/run.mjs
@@ -83,6 +83,8 @@
     try {
         await driver.get(`http://localhost:${PORT}/index.html?worstCaseCount=2&iterationCount=3`);
         await driver.executeAsyncScript((callback) => {
+            // callback() is explicitly called without the default event
+            // as argument to avoid serialization issues with chromedriver.
             globalThis.addEventListener("JetStreamReady", () => callback());
             // We might not get a chance to install the on-ready listener, thus
             // we also check if the runner is ready synchronously.