diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
index 1ad9df2..270de37 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/time/repeat/Repeat.scala
@@ -84,6 +84,9 @@ case class RepeatValue(interval: Option[DurationData] = None,
 
   /**
    * 参考了 ISO 8601, Repeat = R[n]/[interval form]/Duration
+   * 扩展为: Repeat_[time/interval grain 时间表达本身的粒度]_[time/interval 时间或区间表达]_{outer period 外层重复的间隔}_{n x inner_period 内层循环的次数和粒度}
+   * inner_period = 'n' inner repeat grain
+   * 比如每周三到周五的早上 => Repeat_Hour_2024-08-07T08:00:00/2024-08-07T12:00:00_P1W_3P1D
    * 其中 interval form = a/b, /b, a/,
    * @return
    */