diff --git a/api/@ohos.util.d.ts b/api/@ohos.util.d.ts
index 4ec1ce1808fc942d2bd3cfe096227443605a733b..ea00afe0705860e3a1e29303ec61239bb45005b1 100644
--- a/api/@ohos.util.d.ts
+++ b/api/@ohos.util.d.ts
@@ -132,6 +132,14 @@ declare namespace util {
          */
         constructor();
 
+        /**
+         * the textEncoder constructor.
+         * @since 9
+         * @syscap SystemCapability.Utils.Lang
+         * @param encoding The string for encoding format.
+         */
+        constructor(encoding?: string);
+
         /**
          * Returns the result of encoder.
          * @since 7