diff --git a/README.md b/README.md
index ffd5d12..44b6932 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ run:
 ```
 python3 -m venv venv
 . venv/bin/activate
-pip install pytest tox black
+pip install pytest tox black pytest-xdist
 pip install -e .
-tox
+DCC_NEW_TMP_EMAIL='https://ci.testrun.org/new_email?t=1h_2364962873z' tox
 ```