diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index 2cac03e98ae..a3971b67399 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -195,6 +195,7 @@ It is always available.
   module.  \note{The exit function is not called when the program is
   killed by a signal, when a Python fatal internal error is detected,
   or when \code{os._exit()} is called.}
+  \deprecated{2.4}{Use \refmodule{atexit} instead.}
 \end{datadesc}
 
 \begin{funcdesc}{getcheckinterval}{}