diff --git a/Doc/library/tempfile.rst b/Doc/library/tempfile.rst
index b8a5fa0027ffbd..6b23a1bcd630bc 100644
--- a/Doc/library/tempfile.rst
+++ b/Doc/library/tempfile.rst
@@ -62,6 +62,9 @@ The module defines the following user-callable items:
    The :py:data:`os.O_TMPFILE` flag is used if it is available and works
    (Linux-specific, requires Linux kernel 3.11 or later).
 
+   On platforms that are neither Posix nor Cygwin, TemporaryFile is an alias
+   for NamedTemporaryFile.
+
    .. audit-event:: tempfile.mkstemp fullpath tempfile.TemporaryFile
 
    .. versionchanged:: 3.5