diff --git a/docs/docs/services/index.rst b/docs/docs/services/index.rst
index 80c55065e..34d4fa3d3 100644
--- a/docs/docs/services/index.rst
+++ b/docs/docs/services/index.rst
@@ -20,7 +20,7 @@ Note that you can mock multiple services at the same time:
 
 .. sourcecode:: python
 
-    @mock_all
+    @mock_all()
     def test_all_supported_services_at_the_same_time():
         ...