diff --git a/doc/usage/cmd/tftpput.rst b/doc/usage/cmd/tftpput.rst
index 52ba7b1..351c9fa 100644
--- a/doc/usage/cmd/tftpput.rst
+++ b/doc/usage/cmd/tftpput.rst
@@ -1,5 +1,8 @@
 .. SPDX-License-Identifier: GPL-2.0+:
 
+.. index::
+   single: tftpput (command)
+
 tftpput command
 ===============