diff --git a/requests/adapters.py b/requests/adapters.py
index cdc5744c..60afb583 100644
--- a/requests/adapters.py
+++ b/requests/adapters.py
@@ -310,7 +310,6 @@ class HTTPAdapter(BaseAdapter):
         :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
 
         :param proxies: The url of the proxy being used for this request.
-        :param kwargs: Optional additional keyword arguments.
         """
         headers = {}
         username, password = get_auth_from_url(proxy)