diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 7ca58854ac..e55d93f0ae 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -560,10 +560,12 @@ static QWindowGeometrySpecification windowGeometrySpecification = Q_WINDOW_GEOME
     \list
         \li \c {altgr}, detect the key \c {AltGr} found on some keyboards as
                Qt::GroupSwitchModifier (since Qt 5.12).
-        \li \c {darkmode=[1|2]} controls how Qt responds to the activation
+        \li \c {darkmode=[0|1|2]} controls how Qt responds to the activation
                of the \e{Dark Mode for applications} introduced in Windows 10
                1903 (since Qt 5.15).
 
+               A value of 0 disables dark mode support.
+
                A value of 1 causes Qt to switch the window borders to black
                when \e{Dark Mode for applications} is activated and no High
                Contrast Theme is in use. This is intended for applications