Fix documentation typo.
diff --git a/requests/adapters.py b/requests/adapters.py
index 0adca690cd..77badc7fa3 100644
--- a/requests/adapters.py
+++ b/requests/adapters.py
@@ -289,7 +289,7 @@ def send(self, request, stream=False, timeout=None, verify=True, cert=None, prox
         :param stream: (optional) Whether to stream the request content.
         :param timeout: (optional) The timeout on the request.
         :param verify: (optional) Whether to verify SSL certificates.
-        :param vert: (optional) Any user-provided SSL certificate to be trusted.
+        :param cert: (optional) Any user-provided SSL certificate to be trusted.
         :param proxies: (optional) The proxies dictionary to apply to the request.
         """
 

Fairly sure that 'vert' should be 'cert' :)
