diff --git a/docs/03_mink_integration.md b/docs/03_mink_integration.md
index 878f9ba..ac3a061 100644
--- a/docs/03_mink_integration.md
+++ b/docs/03_mink_integration.md
@@ -20,6 +20,7 @@ default:
     extensions:
         # ...
         Behat\MinkExtension:
+            base_url: 'http://example.com'
             sessions:
                 symfony:
                     symfony: ~