diff --git a/wpa_supplicant/doc/docbook/wpa_gui.sgml b/wpa_supplicant/doc/docbook/wpa_gui.sgml
index 84766db3c..fe9123624 100644
--- a/wpa_supplicant/doc/docbook/wpa_gui.sgml
+++ b/wpa_supplicant/doc/docbook/wpa_gui.sgml
@@ -17,6 +17,7 @@
-p path to ctrl sockets
-i ifname
-t
+ -q
@@ -57,6 +58,13 @@
manager supports it). By default the main status window is
shown.
+
+
+ -q
+
+ Run program in the quiet mode - do not display tray
+ icon pop-up messages.
+