Add comment to tox about coverage sed operation

tests/utils.py

@@ -41,7 +41,7 @@ def __exit__(self, *args):
         Remove the tables from our database
         '''
         with connection.schema_editor() as editor:
-            for Model in self.models:
+            for Model in reversed(self.models):
                 editor.delete_model(Model)
 
 

tox.ini

@@ -46,6 +46,9 @@ deps = coverage
 commands =
     python test_migrations/test.py
     python test_migrations/clean.py
+    # adjust path to make sure coverage is recorded correctly.
+    # Might be possible to omit this if we use some PYTHONPATH-trickery to get
+    # this testenv to use the actual code in {toxinidir}/modeltrans.
     sed -i 's/.tox\/migrate\/lib\/python3.5\/site-packages\///g' .coverage
 
 [testenv:flake8]