diff --git a/src/widgets/util/qsystemtrayicon.cpp b/src/widgets/util/qsystemtrayicon.cpp
index d264cfe632..903cb4380c 100644
--- a/src/widgets/util/qsystemtrayicon.cpp
+++ b/src/widgets/util/qsystemtrayicon.cpp
@@ -92,7 +92,9 @@ static QIcon messageIcon2qIcon(QSystemTrayIcon::MessageIcon icon)
 
     Only on X11, when a tooltip is requested, the QSystemTrayIcon receives a QHelpEvent
     of type QEvent::ToolTip. Additionally, the QSystemTrayIcon receives wheel events of
-    type QEvent::Wheel. These are not supported on any other platform.
+    type QEvent::Wheel. These are not supported on any other platform. Note: Since GNOME
+    Shell version 3.26, not all QSystemTrayIcon::ActivationReason are supported by the
+    system without shell extensions installed.
 
     \sa QDesktopServices, {Desktop Integration}, {System Tray Icon Example}
 */