diff --git a/aodhclient/exceptions.py b/aodhclient/exceptions.py
index 5a12640..cf96c67 100644
--- a/aodhclient/exceptions.py
+++ b/aodhclient/exceptions.py
@@ -142,7 +142,7 @@ _code_map = dict(
 
 
 def from_response(response, url, method=None):
-    """Return an instance of one of the ClientException on an requests response.
+    """Return an instance of ClientException on an requests response.
 
     Usage::
 
diff --git a/tox.ini b/tox.ini
index 90f7898..ea9de24 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,7 +39,7 @@ commands =
        stestr --test-path {env:OS_TEST_PATH} run --slowest {posargs}
 
 [testenv:pep8]
-deps = hacking<3.1.0,>=3.0
+deps = hacking>=6.1.0,<6.2.0
 commands = flake8
 
 [testenv:venv]