specify sshkey is *private*

IPython/parallel/client/client.py

@@ -171,7 +171,7 b' class Client(HasTraits):'
         A string of the form passed to ssh, i.e. 'server.tld' or '[e-mail]:port'
         If keyfile or password is specified, and this is not, it will default to
         the ip given in addr.
-    sshkey : str; path to public ssh key file
+    sshkey : str; path to ssh private key file
         This specifies a key to be used in ssh login, default None.
         Regular default ssh keys will be used without specifying this argument.
     password : str 

IPython/parallel/engine/engine.py

@@ -57,7 +57,7 b' class EngineFactory(RegistrationFactory):'
     sshserver=Unicode(config=True,
         help="""The SSH server to use for tunneling connections to the Controller.""")
     sshkey=Unicode(config=True,
-        help="""The SSH keyfile to use when tunneling connections to the Controller.""")
+        help="""The SSH private key file to use when tunneling connections to the Controller.""")
     paramiko=Bool(sys.platform == 'win32', config=True,
         help="""Whether to use paramiko instead of openssh for tunnels.""")