Corrected docstring on AccessTokenCredentials class
diff --git a/oauth2client/client.py b/oauth2client/client.py
index 0433600..dc9fb60 100644
--- a/oauth2client/client.py
+++ b/oauth2client/client.py
@@ -306,7 +306,7 @@
     Credentials objects are usually instantiated by a Flow.
 
     Args:
-      token_uri: string, URI of token endpoint.
+      access_token: string, access token.
       user_agent: string, The HTTP User-Agent to provide for this application.
 
     Notes: