diff --git a/api/@internal/component/ets/common.d.ts b/api/@internal/component/ets/common.d.ts
index 0494b0b404f08c745fbfce22d0e61ad45372176e..b4dfde727859f65b4733009a6de6d9f6988a514f 100644
--- a/api/@internal/component/ets/common.d.ts
+++ b/api/@internal/component/ets/common.d.ts
@@ -33795,6 +33795,17 @@ declare abstract class TextContentControllerBase {
    */
   addText(text: string, textOperationOptions?: TextContentControllerOptions): number;
 
+  /**
+   * Update the styles of placeholder by setStyledString.
+   *
+   * @param { StyledString } value
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 21
+   */
+  setStyledPlaceholder(value: StyledString): void;
+
   /**
    * Delete text in TextRange.
    *