diff --git a/api/@internal/component/ets/common.d.ts b/api/@internal/component/ets/common.d.ts
index 4155378988fee74cc8e853a2e48122e4f5d57e43..ebd861ee3da8ccfc37efe24e9447d407e8b93fd4 100644
--- a/api/@internal/component/ets/common.d.ts
+++ b/api/@internal/component/ets/common.d.ts
@@ -33889,6 +33889,18 @@ declare abstract class TextContentControllerBase {
    * @arkts 1.1&1.2
    */
   getText(range?: TextRange): string;
+
+  /**
+   * Set the styled placeholder
+   *
+   * @param { StyledString } styledString - The styledString for placeholder.
+   *     If the parameter is invalid, this method will have no effect.
+   * @syscap SystemCapability.ArkUI.ArkUI.Full
+   * @crossplatform
+   * @atomicservice
+   * @since 21
+   */
+  setStyledPlaceholder(styledString: StyledString): void;
 }
 
 /**