diff --git a/README_development.rst b/README_development.rst
index 995cfd8..84966e0 100644
--- a/README_development.rst
+++ b/README_development.rst
@@ -29,6 +29,10 @@ Setup test requirements
     # run tests for all supported envs
     tox
 
+    # execute stuff on specific env (examples)
+    tox -e py3-driver-mock -- python
+    tox -e py3-driver-mock -- python test/testsuite.py test_mock.MockTest.test_sql_exception_on_commit
+
     # activate and work on specific env
     . .tox/py35-driver-mock/bin/activate
     export CLASSPATH=$VIRTUAL_ENV/javalib/*
diff --git a/tox.ini b/tox.ini
index 5e2bec4..3496e17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,4 +33,4 @@ commands =
   driver-mock: mvn -Dmaven.repo.local={toxworkdir}/shared/.m2/repository -f mockdriver/pom.xml install
   driver-mock: jip install org.jaydebeapi:mockdriver:1.0-SNAPSHOT
   driver-hsqldb: python test/doctests.py
-  coverage run -a --source jaydebeapi test/testsuite.py {env:TESTNAME}
+  {posargs:coverage run -a --source jaydebeapi test/testsuite.py {env:TESTNAME}}