diff --git a/service_container/autowiring.rst b/service_container/autowiring.rst
index bcf75fc2268..64b587dce2b 100644
--- a/service_container/autowiring.rst
+++ b/service_container/autowiring.rst
@@ -211,7 +211,7 @@ using autowiring:
             AppBundle\Rot13Transformer: ~
 
             # the ``AppBundle\Rot13Transformer`` service will be injected when
-            # a ``AppBundle\TransformerInterface`` type-hint is detected
+            # an ``AppBundle\TransformerInterface`` type-hint is detected
             AppBundle\TransformerInterface: '@AppBundle\Rot13Transformer'
 
             AppBundle\TwitterClient: