diff --git a/doc/usage/cmd/exit.rst b/doc/usage/cmd/exit.rst
index 3edb128..2f250bf 100644
--- a/doc/usage/cmd/exit.rst
+++ b/doc/usage/cmd/exit.rst
@@ -1,3 +1,6 @@
+.. index::
+   single: exit (command)
+
 exit command
 ============