diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 63d52062bc23f3..4c7fb276311469 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -921,9 +921,12 @@ Reassigning them to new values is unsupported:
.. attribute:: Popen.returncode
- The child return code, set by :meth:`poll` and :meth:`wait` (and indirectly
- by :meth:`communicate`). A ``None`` value indicates that the process
- hasn't terminated yet.
+ The child return code. Initially ``None``, :attr:`returncode` is set by
+ a call to the :meth:`poll`, :meth:`wait`, or :meth:`communicate` methods
+ if they detect that the process has terminated.
+
+ A ``None`` value indicates that the process hadn't yet terminated at the
+ time of the last method call.
A negative value ``-N`` indicates that the child was terminated by signal
``N`` (POSIX only).
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