diff --git a/doc/usage/cmd/gpt.rst b/doc/usage/cmd/gpt.rst
index cbbe44a..8534f78 100644
--- a/doc/usage/cmd/gpt.rst
+++ b/doc/usage/cmd/gpt.rst
@@ -1,5 +1,8 @@
 .. SPDX-License-Identifier: GPL-2.0+
 
+.. index::
+   single: gpt (command)
+
 gpt command
 ===========