diff --git a/Understanding-and-debugging-Nimbus-EVM-JSON-tests.md b/Understanding-and-debugging-Nimbus-EVM-JSON-tests.md
index b2956e4..67a03e5 100644
--- a/Understanding-and-debugging-Nimbus-EVM-JSON-tests.md
+++ b/Understanding-and-debugging-Nimbus-EVM-JSON-tests.md
@@ -174,8 +174,9 @@ Some terminals don't support colour output and in this case you will see lots of
 
 ### py-evm
 
+- run a single JSON test with tracing enabled (by the logging level):
 ```
-pytest -v --log-level=DEBUG -k fixtures/GeneralStateTests/stAttackTest/ContractCreationSpam.json tests/json-fixtures/test_state.py --fork Homestead
+pytest -o log_cli=true --log-cli-level=NOTSET -k fixtures/GeneralStateTests/stAttackTest/ContractCreationSpam.json tests/json-fixtures/test_state.py --fork Homestead
 ```
 Installation hints:
 - use a virtualenv