diff --git a/packages/vuepress-docs/docs/en-US/plugins/scroll-bar.md b/packages/vuepress-docs/docs/en-US/plugins/scroll-bar.md
index 07a43e3a..6b514246 100644
--- a/packages/vuepress-docs/docs/en-US/plugins/scroll-bar.md
+++ b/packages/vuepress-docs/docs/en-US/plugins/scroll-bar.md
@@ -192,7 +192,21 @@ new BScroll('.bs-wrapper', {
   - **Type**: `number`
   - **Default**: `300`
 
-  the scroll time after the scrollbar track is clicked,.
+  the scroll time after the scrollbar track is clicked.
+
+### fadeInTime <Badge text="2.4.0" />
+
+  - **Type**: `number`
+  - **Default**: `250`
+
+  The duration of the animation when the scrollbar fades in.
+
+### fadeOutTime <Badge text="2.4.0" />
+
+  - **Type**: `number`
+  - **Default**: `500`
+
+  The duration of the animation when the scrollbar fades out.
 
 :::tip
 When `scrollbar` is configured as `true`, the plugin uses the default plugin option.
diff --git a/packages/vuepress-docs/docs/zh-CN/plugins/scroll-bar.md b/packages/vuepress-docs/docs/zh-CN/plugins/scroll-bar.md
index 862458bb..09f3d45a 100644
--- a/packages/vuepress-docs/docs/zh-CN/plugins/scroll-bar.md
+++ b/packages/vuepress-docs/docs/zh-CN/plugins/scroll-bar.md
@@ -185,12 +185,20 @@ yarn add @better-scroll/scroll-bar
 
   滚动条轨道被点击之后，滚动距离的计算方式，默认与浏览器的表现形式一样，可以配置为 `'clickedPoint'`，代表滚动条滚动至点击的位置。
 
-### scrollbarTrackOffsetTime <Badge text="2.2.0" />
+### fadeInTime <Badge text="2.4.0" />
 
   - **类型**：`number`
-  - **默认值**：`300`
+  - **默认值**：`250`
+
+  滚动条渐显的动画时长。
+
+### fadeOutTime <Badge text="2.4.0" />
+
+  - **类型**：`number`
+  - **默认值**：`500`
+
+  滚动条渐隐的动画时长。
 
-  滚动条轨道被点击之后，滚动位移的时间
 
 :::tip 提示
 当 scrollbar 配置为 true 的时候，插件内部使用的是默认的插件选项对象。