diff --git a/.travis.yml b/.travis.yml
index 313660f..873d54b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,6 @@ sudo: false
 env:
     - TOX_ENV=py27-flake8
     - TOX_ENV=py27
-    - TOX_ENV=py33
     - TOX_ENV=py34
     - TOX_ENV=py35
 
diff --git a/dotenv.py b/dotenv.py
index 48fd2b5..63be7e6 100644
--- a/dotenv.py
+++ b/dotenv.py
@@ -34,17 +34,17 @@
 """, re.IGNORECASE | re.VERBOSE)
 
 
-def read_dotenv(dotenv=None, overwrite=False):
+def read_dotenv(dotenv=None, override=False):
     """
     Read a .env file into os.environ.
 
     If not given a path to a dotenv path, does filthy magic stack backtracking
     to find manage.py and then find the dotenv.
 
-    If tests rely on .env files, setting the overwrite flag to True is a safe way to ensure tests run consistently
-    across all environments.
+    If tests rely on .env files, setting the overwrite flag to True is a safe
+    way to ensure tests run consistently across all environments.
 
-    :param overwrite: True if values in .env should overwrite export environment variables.
+    :param override: True if values in .env should override system variables.
     """
     if dotenv is None:
         frame_filename = sys._getframe().f_back.f_code.co_filename
@@ -56,7 +56,7 @@ def read_dotenv(dotenv=None, overwrite=False):
     if os.path.exists(dotenv):
         with open(dotenv) as f:
             for k, v in parse_dotenv(f.read()).items():
-                if overwrite:
+                if override:
                     os.environ[k] = v
                 else:
                     os.environ.setdefault(k, v)