diff --git a/README.md b/README.md
index 8fa9ff7..b7b89dd 100644
--- a/README.md
+++ b/README.md
@@ -345,6 +345,13 @@ To run the test suite, go to the project root and run:
 $ php vendor/bin/phpunit
 ```
 
+The test suite contains tests that rely on a working internet connection,
+alternatively you can also run it like this:
+
+```bash
+$ php vendor/bin/phpunit --exclude-group internet
+```
+
 ## License
 
 MIT
diff --git a/tests/FunctionalTest.php b/tests/FunctionalTest.php
index e7e8ae6..a8f2c04 100644
--- a/tests/FunctionalTest.php
+++ b/tests/FunctionalTest.php
@@ -9,6 +9,7 @@
 use Clue\React\Block;
 use React\Socket\SecureConnector;
 
+/** @group internet */
 class FunctionalTest extends AbstractTestCase
 {
     private $loop;