diff --git a/Doc/library/platform.rst b/Doc/library/platform.rst
index 99a46fa..0e65eb1 100644
--- a/Doc/library/platform.rst
+++ b/Doc/library/platform.rst
@@ -214,6 +214,10 @@
    preferring :func:`win32pipe.popen`.  On Windows NT, :func:`win32pipe.popen`
    should work; on Windows 9x it hangs due to bugs in the MS C library.
 
+   .. deprecated:: 3.3
+      This function is obsolete.  Use the :mod:`subprocess` module.  Check
+      especially the :ref:`subprocess-replacements` section.
+
 
 Mac OS Platform
 ---------------