[Bug #729817] Document the rexec and Bastion modules as dead
diff --git a/Doc/lib/libbastion.tex b/Doc/lib/libbastion.tex
index 7a4f932..9f45c47 100644
--- a/Doc/lib/libbastion.tex
+++ b/Doc/lib/libbastion.tex
@@ -4,7 +4,12 @@
 \declaremodule{standard}{Bastion}
 \modulesynopsis{Providing restricted access to objects.}
 \moduleauthor{Barry Warsaw}{bwarsaw@python.org}
+\versionchanged[Disabled module]{2.3}
 
+\begin{notice}[warning]
+  The documentation has been left in place to help in reading old code
+  that uses the module.
+\end{notice}
 
 % I'm concerned that the word 'bastion' won't be understood by people
 % for whom English is a second language, making the module name