diff --git a/api/@internal/component/ets/panel.d.ts b/api/@internal/component/ets/panel.d.ts
index 7b0dc56130c9196cf5272229e63b365692c675af..3fcadfe46d03b7d4f84a05e22605bb69155a4e8c 100644
--- a/api/@internal/component/ets/panel.d.ts
+++ b/api/@internal/component/ets/panel.d.ts
@@ -121,6 +121,12 @@ declare class PanelAttribute extends CommonMethod<PanelAttribute> {
    */
   show(value: boolean): PanelAttribute;
 
+  /**
+   * Called when the panel background mask is requested.
+   * @since 9
+   */
+  backgroundMask(color: number | string | Color): PanelAttribute;
+
   /**
    * Called when the state of the slidable panel changes.
    * @since 7
@@ -146,6 +152,12 @@ declare class PanelAttribute extends CommonMethod<PanelAttribute> {
       mode: PanelMode,
     ) => void,
   ): PanelAttribute;
+
+  /**
+   * Called when height of the panel is changed
+   * @since 9
+   */
+   onHeightChange(callback: (value: number) => void): PanelAttribute;
 }
 
 declare const Panel: PanelInterface;