diff --git a/doc/usage/cmd/mbr.rst b/doc/usage/cmd/mbr.rst
index bddf2f6..925a118 100644
--- a/doc/usage/cmd/mbr.rst
+++ b/doc/usage/cmd/mbr.rst
@@ -1,5 +1,8 @@
 .. SPDX-License-Identifier: GPL-2.0+
 
+.. index::
+   single: mbr (command)
+
 mbr command
 ===========