diff --git a/config/services.yaml b/config/services.yaml
index 3255329..8087d8f 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -11,22 +11,29 @@ services:
         autowire: true      # Automatically injects dependencies in your services.
         autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
 
-    # makes classes in src/ available to be used as services
-    # this creates a service per class whose id is the fully-qualified class name
+    # Murph services
     App\Core\:
         resource: '../vendor/murph/murph-core/src/core/'
         exclude:
             - '../vendor/murph/murph-core/src/core/DependencyInjection/'
             - '../vendor/murph/murph-core/src/core/Entity/'
 
+    # Redirections
     App\Core\EventListener\RedirectListener:
         tags:
             - { name: kernel.event_listener, event: kernel.exception }
 
+    # Analytics
     App\Core\EventListener\AnalyticListener:
         tags:
             - { name: kernel.event_listener, event: kernel.request }
 
+    # A/B Testing
+    App\Core\EventListener\AbListener:
+        tags:
+            - { name: kernel.event_listener, event: kernel.request }
+            - { name: kernel.event_listener, event: kernel.response }
+
     App\:
         resource: '../src/'
         exclude: