--- a/Doc/lib/libsys.tex	Thu Mar 25 16:57:04 1999 +0000
+++ b/Doc/lib/libsys.tex	Thu Mar 25 20:30:00 1999 +0000
@@ -122,9 +122,9 @@
   This value is not actually defined by the module, but can be set by
   the user (or by a program) to specify a clean-up action at program
   exit.  When set, it should be a parameterless function.  This function
-  will be called when the interpreter exits in any way (except when a
-  fatal error occurs: in that case the interpreter's internal state
-  cannot be trusted).
+  will be called when the interpreter exits.  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.
 \end{datadesc}
 
 \begin{funcdesc}{getrefcount}{object}