diff --git a/py/io/dupfile.py b/py/io/dupfile.py
index d272ce42d..daaf26a57 100644
--- a/py/io/dupfile.py
+++ b/py/io/dupfile.py
@@ -4,8 +4,8 @@ import os
 def dupfile(f, mode=None, buffering=0, raising=False): 
     """ return a new open file object that's a duplicate of f
 
-        mode is duplicated if not given, buffering controls 
-        buffer size (defaulting to no buffering) and raising
+        mode is duplicated if not given, 'buffering' controls 
+        buffer size (defaulting to no buffering) and 'raising'
         defines whether an exception is raised when an incompatible
         file object is passed in (if raising is False, the file
         object itself will be returned)