diff --git a/interfaces/innerkits/wm/window.h b/interfaces/innerkits/wm/window.h
index 478e0d23d648b1c7a119e4bf1f846d931369f5f1..2460d4438317c50d0e46f8c3e36f6fce853ec9f5 100644
--- a/interfaces/innerkits/wm/window.h
+++ b/interfaces/innerkits/wm/window.h
@@ -4589,6 +4589,13 @@ public:
     {
         return false;
     }
+
+    /**
+     * @brief notify window is full screen in force split mode.
+     *
+     * @param shouldFullScreen true means full screen, false means force split.
+     */
+    virtual void NotifyIsFullScreenInForceSplitMode(bool isFullScreen) {}
 };
 }
 }