diff --git a/doc/example_config/my/config/__init__.py b/doc/example_config/my/config/__init__.py
index dd427b6..f93155c 100644
--- a/doc/example_config/my/config/__init__.py
+++ b/doc/example_config/my/config/__init__.py
@@ -3,6 +3,7 @@ Feel free to remove this if you don't need it/add your own custom settings and u
 """
 
 class hypothesis:
+    from my.core import Paths
     # expects outputs from https://github.com/karlicoss/hypexport
     # (it's just the standard Hypothes.is export format)
-    export_path = '/path/to/hypothesis/data'
+    export_path: Paths = '/path/to/hypothesis/data'
diff --git a/setup.py b/setup.py
index f2c2b03..657ed1d 100644
--- a/setup.py
+++ b/setup.py
@@ -53,6 +53,7 @@ def main():
                 'pytest',
                 'pylint',
                 'mypy',
+                'lxml', # for mypy coverage
 
                 # used in some tests
                 'pandas',
diff --git a/tox.ini b/tox.ini
index f5fabca..1df1034 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.5
-envlist = py3,mypy # pylint
+envlist = py3,mypy,mypy-modules # pylint
 
 # TODO ugh. unclear how to reuse setup.cfg deps in tox
 [testenv]
@@ -24,6 +24,18 @@ commands =
 commands = ./demo.py
 
 
+# specific modules that are known to be mypy compliant (to avoid false negatives)
+[testenv:mypy-modules]
+# todo add a stub with all the various configs for mypy/doc
+setenv = MYPYPATH=doc/example_config
+commands =
+    # TODO ugh. somehow, user installed (editable??) packages leak into this environment??
+    pip install -e .[testing] .[optional]
+    pip install git+https://github.com/karlicoss/hypexport
+    python3 -m mypy -p my.hypothesis {posargs}
+
+
+# ideally, keep core modules only here
 [testenv:mypy]
 skip_install = true
 commands =