124,125c124,128
<         specified, it sets the buffer size for the I/O pipes.  The file objects
<         (child_stdout, child_stdin) are returned."""
---
>         specified, it sets the buffer size for the I/O pipes.  On Unix
>         platforms, 'cmd' can be a list, in which case arguments will be passed
>         to the program directly without shell intervention. If 'cmd' is a 
>         string it will be passed to the shell. The file objects
>         (child_stdout, child_stdin) are returned. """