Add docstring for SSH config as per #429.

1 files changed, 7 insertions, 2 deletions

diff --git a/pexpect/pxssh.py b/pexpect/pxssh.py
index 2f22ace..44e4c60 100644
--- a/pexpect/pxssh.py
+++ b/pexpect/pxssh.py
@@ -294,10 +294,15 @@ class pxssh (spawn):
         session to do so. Setting this option to `False` and not having an active session
         will trigger an error.
         
-        Set ``ssh_key`` to a string that is a file path to an SSH private key. Doing so
-        will use that SSH key for the session authentication.
+        Setting ``ssh_key`` to a file path to an SSH private key will use that SSH key
+        for the session authentication.
         Set ``ssh_key`` to `True` to force passing the current SSH authentication socket
         to the desired ``hostname``.
+        
+        Setting ``ssh_config`` to a file path of an SSH client config file will pass that
+        file to the client to handle itself. You may set any options you wish in here, however
+        doing so will require you to post extra information that you may not want to if you
+        run into issues.
         '''
         
         session_regex_array = ["(?i)are you sure you want to continue connecting", original_prompt, password_regex, "(?i)permission denied", "(?i)terminal type", TIMEOUT]