diff --git a/tox.ini b/tox.ini
index 1761a8f..f77e73e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,18 @@
 [tox]
 minversion = 3.5
+envlist = tests-core,tests-all,demo,mypy-core,mypy-misc
 # https://github.com/tox-dev/tox/issues/20#issuecomment-247788333
 # hack to prevent .tox from crapping to the project directory
 toxworkdir={env:TOXWORKDIR_BASE:}{toxinidir}/.tox
 
 [testenv]
-passenv =
-    # useful for tests to know they are running under ci
-    CI
-    CI_*
-    # respect user's cache dirs to prevent tox from crapping into project dir
-    MYPY_CACHE_DIR
-    PYTHONPYCACHEPREFIX
+passenv = 
+# useful for tests to know they are running under ci
+  CI
+  CI_*
+# respect user's cache dirs to prevent tox from crapping into project dir
+  MYPY_CACHE_DIR
+  PYTHONPYCACHEPREFIX
 
 
 # just the very core tests with minimal dependencies