diff --git a/desktop_env/server/README.md b/desktop_env/server/README.md
index eec1448..571081a 100644
--- a/desktop_env/server/README.md
+++ b/desktop_env/server/README.md
@@ -63,3 +63,11 @@ application[name=Thunderbird] page-tab-list[attr|id=\"tabmail-tabs\"]>page-tab[n
 This selector will select the page tab of profile manager in Thunderbird (if open).
 
 For usage of CSS selector: <https://www.w3.org/TR/selectors-3/>. For usage of XPath: <https://www.w3.org/TR/xpath-31/>.
+
+#### Manual check
+
+You can use accerciser to check the accessibility tree on GNOME VM.
+
+```sh
+sudo apt install accerciser
+```