warn about some members of the commands module
diff --git a/Doc/library/commands.rst b/Doc/library/commands.rst
index 177710b..c3f7710 100644
--- a/Doc/library/commands.rst
+++ b/Doc/library/commands.rst
@@ -42,7 +42,13 @@
.. deprecated:: 2.6
This function is nonobvious and useless, also the name is misleading in the
- presence of :func:`getstatusoutput`.
+ presence of :func:`getstatusoutput`. It is removed in 3.x.
+
+.. warning::
+
+ Two undocumented functions in this module, :func:`mk2arg` and :func:`mkargs`
+ are removed in 3.x.
+
Example::