diff --git a/microversion_parse/__init__.py b/microversion_parse/__init__.py
index 3605ff2..d126ea7 100644
--- a/microversion_parse/__init__.py
+++ b/microversion_parse/__init__.py
@@ -25,7 +25,7 @@ class Version(collections.namedtuple('Version', 'major minor')):
     """
 
     def __new__(cls, major, minor):
-        """Add mix and max version attributes to the tuple."""
+        """Add min and max version attributes to the tuple."""
         self = super(Version, cls).__new__(cls, major, minor)
         self.max_version = (-1, 0)
         self.min_version = (-1, 0)
diff --git a/tox.ini b/tox.ini
index 0d8a40e..9e7c084 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ minversion = 3.1.1
 skipsdist = True
 # If you want pypy or pypy3, do 'tox -epypy,pypy3', it might work!
 # And you can get coverage with 'tox -ecover'.
-envlist = py36,py35,pep8
+envlist = py36,py37,pep8
 ignore_basepython_conflict = True
 
 [testenv]