diff --git a/README.md b/README.md
index e5b4d68..8700a7a 100644
--- a/README.md
+++ b/README.md
@@ -109,4 +109,6 @@ the Kernel is rebooted.
 ## Limitations
 
 This trick will not work if you have two different PHP processes, i.e. you are running
-your tests with Panther, Selenium etc.
+your tests with Panther, Selenium etc. 
+
+We can also not create a proxy if your service is final.