Issue #11393: Add the new faulthandler module
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index b5a9b32..8a5a662 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -498,6 +498,13 @@
separated string, it is equivalent to specifying :option:`-W` multiple
times.
+.. envvar:: PYTHONFAULTHANDLER
+
+ If this environment variable is set, :func:`faulthandler.enable` is called
+ at startup: install a handler for :const:`SIGSEGV`, :const:`SIGFPE`,
+ :const:`SIGBUS` and :const:`SIGILL` signals to dump the Python traceback.
+ This is equivalent to :option:`-X` ``faulthandler`` option.
+
Debug-mode variables
~~~~~~~~~~~~~~~~~~~~