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-rw-r--r--Doc/library/subprocess.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index f4eafc4..eb12bff 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -102,6 +102,13 @@ This module defines one class called :class:`Popen`:
variables for the new process; these are used instead of inheriting the current
process' environment, which is the default behavior.
+ .. warning::
+
+ When replacing the environment you must provide any variables
+ required for the program to execute. On Windows, in order to run
+ a side-by-side assembly the specified *env* must include a valid
+ :envvar:`SystemRoot`.
+
If *universal_newlines* is :const:`True`, the file objects stdout and stderr are
opened as text files, but lines may be terminated by any of ``'\n'``, the Unix
end-of-line convention, ``'\r'``, the old Macintosh convention or ``'\r\n'``, the