Update index

README.md

@@ -28,6 +28,7 @@ Simple, native and efficient **local ad blocker**. Bash script compatible with *
 
 - [Commands](#-commands)
 - [Install or update](#%EF%B8%8F-install-or-update)
+- [Check if you block ads](#-check-if-you-block-ads)
 - [Auto update of domains to be blocked](#-auto-update-of-domains-to-be-blocked)
 - [Uninstall](#-uninstall)
 - [Not blocking certain domains](#-not-blocking-certain-domains)
@@ -82,6 +83,25 @@ Optional but recommended, make a backup of your hosts file.
 sudo cp /etc/hosts /etc/hosts.backup
 ```
 
+## 🧪 Check if you block ads
+
+You can run a test to see if the domains are blocked.
+
+For example, you can run the following command.
+
+``` bash
+curl googleadservices.com
+```
+
+If you get an error like this, it means that the domain is blocked.
+
+``` shell
+curl: (7) Failed to connect to googleadservices.com port 80 after 2 ms: Could not connect to server
+```
+
+But if you get a response with HTML, it means that the domain is not blocked (maybe a 404 error).
+
+
 ## 🤖 Auto update of domains to be blocked
 
 Open your `cron`.