diff --git a/package/contents/ui/config.ui b/package/contents/ui/config.ui
index c8c842c..342c4ee 100644
--- a/package/contents/ui/config.ui
+++ b/package/contents/ui/config.ui
@@ -221,7 +221,7 @@
                                         <string>Stack columns by default</string>
                                     </property>
                                     <property name="toolTip">
-                                        <string>New columns start in stacked mode</string>
+                                        <string>New columns start in stacked mode (one window in the column visible, others shaded). Not supported on Wayland.</string>
                                     </property>
                                 </widget>
                             </item>