diff --git a/doc/app_notes/csi_fuzzer.md b/doc/app_notes/csi_fuzzer.md
index 9acf213..a4c921c 100644
--- a/doc/app_notes/csi_fuzzer.md
+++ b/doc/app_notes/csi_fuzzer.md
@@ -6,7 +6,7 @@ SPDX-License-Identifier: AGPL-3.0-or-later
 
 [Openwifi CSI fuzzer for authorized sensing and covert channels](https://arxiv.org/pdf/2105.07428.pdf) (accepted by ACM WiSec 2021)
 
-CSI (Channel State Information) of WiFi systems is available in some WiFi chips and can be used for environment (people, object, activity) sensing passively and secretly.
+CSI (Channel State Information) of WiFi systems is available in some WiFi chips and can be used for sensing the environment (keystrokes, people, object) passively and secretly.
  
 How could a CSI fuzzer stop unauthorized sensing?