diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index 55b24eada13c61900b7f70b69b071912f05c7411..82bfd58926633724691ff29a0e92f2c59716165c 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -116,6 +116,16 @@ run. The statistics can be seen using ``bpftool``.
 = ===================================
 
 
+cad_pid
+=======
+
+This is the pid which will be signalled on reboot (notably, by
+Ctrl-Alt-Delete). Writing a value to this file which doesn't
+correspond to a running process will result in ``-ESRCH``.
+
+See also `ctrl-alt-del`_.
+
+
 cap_last_cap
 ============