diff --git a/docs/src/test-advanced-js.md b/docs/src/test-advanced-js.md
index 5f7c3fde3e..1ab14decfd 100644
--- a/docs/src/test-advanced-js.md
+++ b/docs/src/test-advanced-js.md
@@ -206,7 +206,7 @@ export const test = base.extend<{ saveLogs: void }>({
 
 To launch a server during the tests, use the `webServer` option in the [configuration file](#configuration-object).
 
-You can specify a port via `port` or additional environment variables, see [here](#configuration-object). The server will wait for it to be available before running the tests. For continuous integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
+You can specify a port via `port` or additional environment variables, see [here](#configuration-object). The server will wait for it to be available (on `127.0.0.1` or `::1`) before running the tests. For continuous integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
 
 The port gets then passed over to Playwright as a [`param: baseURL`] when creating the context [`method: Browser.newContext`].
 
diff --git a/docs/src/test-api/class-testconfig.md b/docs/src/test-api/class-testconfig.md
index 461d5aa1c3..7053adb519 100644
--- a/docs/src/test-api/class-testconfig.md
+++ b/docs/src/test-api/class-testconfig.md
@@ -567,9 +567,11 @@ export default config;
 
 Launch a development web server during the tests.
 
-The server will wait for it to be available before running the tests. For continuous integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
+The server will wait for it to be available on `127.0.0.1` or `::1` before running the tests. For continuous integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
 
 The port gets then passed over to Playwright as a `baseURL` when creating the context [`method: Browser.newContext`].
+For example `8080` ends up in `baseURL` to be `http://localhost:8080`. If you want to use `https://` you need to manually specify
+the `baseURL` inside `use`.
 
 ```js js-flavor=ts
 // playwright.config.ts
diff --git a/packages/playwright-test/types/test.d.ts b/packages/playwright-test/types/test.d.ts
index 513083b713..616e6c6793 100644
--- a/packages/playwright-test/types/test.d.ts
+++ b/packages/playwright-test/types/test.d.ts
@@ -570,11 +570,14 @@ interface TestConfig {
   /**
    * Launch a development web server during the tests.
    *
-   * The server will wait for it to be available before running the tests. For continuous integration, you may want to use
-   * the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
+   * The server will wait for it to be available on `127.0.0.1` or `::1` before running the tests. For continuous
+   * integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server
+   * on the CI.
    *
    * The port gets then passed over to Playwright as a `baseURL` when creating the context
-   * [browser.newContext([options])](https://playwright.dev/docs/api/class-browser#browser-new-context).
+   * [browser.newContext([options])](https://playwright.dev/docs/api/class-browser#browser-new-context). For example `8080`
+   * ends up in `baseURL` to be `http://localhost:8080`. If you want to use `https://` you need to manually specify the
+   * `baseURL` inside `use`.
    *
    * ```ts
    * // playwright.config.ts
@@ -1056,11 +1059,14 @@ export interface FullConfig<TestArgs = {}, WorkerArgs = {}> {
   /**
    * Launch a development web server during the tests.
    *
-   * The server will wait for it to be available before running the tests. For continuous integration, you may want to use
-   * the `reuseExistingServer: !process.env.CI` option which does not use an existing server on the CI.
+   * The server will wait for it to be available on `127.0.0.1` or `::1` before running the tests. For continuous
+   * integration, you may want to use the `reuseExistingServer: !process.env.CI` option which does not use an existing server
+   * on the CI.
    *
    * The port gets then passed over to Playwright as a `baseURL` when creating the context
-   * [browser.newContext([options])](https://playwright.dev/docs/api/class-browser#browser-new-context).
+   * [browser.newContext([options])](https://playwright.dev/docs/api/class-browser#browser-new-context). For example `8080`
+   * ends up in `baseURL` to be `http://localhost:8080`. If you want to use `https://` you need to manually specify the
+   * `baseURL` inside `use`.
    *
    * ```ts
    * // playwright.config.ts