diff --git a/Doc/library/tkinter.rst b/Doc/library/tkinter.rst
index dfade1345ca9013..44b3c42a936a397 100644
--- a/Doc/library/tkinter.rst
+++ b/Doc/library/tkinter.rst
@@ -3298,6 +3298,14 @@ Toplevel widgets
    profile files is the :envvar:`HOME` environment variable or, if that
    isn't defined, then :data:`os.curdir`.
 
+   .. note::
+
+      On Windows, creating a Tcl interpreter (by instantiating :class:`Tk` or
+      calling :func:`Tcl`) sets the :envvar:`HOME` environment variable for
+      the process, if it is not already set, to ``%HOMEDRIVE%%HOMEPATH%`` (or
+      :envvar:`USERPROFILE`, or ``c:\``).  This is done by Tcl and can affect
+      other code that reads :envvar:`HOME`.
+
    .. attribute:: tk
 
       The Tk application object created by instantiating :class:`Tk`.  This
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 811e796f7766e94..b3c23f0abc2d889 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -345,7 +345,7 @@ def _isreservedname(name):
 def expanduser(path):
     """Expand ~ and ~user constructs.
 
-    If user or $HOME is unknown, do nothing."""
+    If user or home directory is unknown, do nothing."""
     path = os.fspath(path)
     if isinstance(path, bytes):
         seps = b'\\/'