add zh changelog of 5.1.1
diff --git a/en/changelog.md b/en/changelog.md
index 24ffbf0..e124d9b 100644
--- a/en/changelog.md
+++ b/en/changelog.md
@@ -1,10 +1,11 @@
## v5.1.1
+<div class="time">2021-04-27</div>
+ [Fix] [geo] Fix tooltip don't show on `geo` component. [#14767](https://github.com/apache/echarts/issues/14767) ([pissang](https://github.com/pissang))
+ [Fix] [tooltip] Fix the position of tooltip may be incorrect when `appendToBody`. [#14713](https://github.com/apache/echarts/issues/14713) ([plainheart](https://github.com/plainheart))
+ [Fix] [map] Fix tooltip may have error on map series. [#14704](https://github.com/apache/echarts/issues/14704) ([plainheart](https://github.com/plainheart))
+ [Fix] [pie] Fix labelLine may still appear on emphasis when changed from outside to inside. [#14702](https://github.com/apache/echarts/issues/14702) ([villebro](https://github.com/villebro))
+ [Fix] [type] Fix type error on earlier TypeScript versions. Close [#14716](https://github.com/apache/echarts/issues/14716) [#14739](https://github.com/apache/echarts/issues/14739)
-+ [Fix] [type] `symbolOffset` incorrectly marked as mandatory. [#14693](https://github.com/apache/echarts/pull/14693) ([villebro](https://github.com/villebro))
++ [Fix] [type] `symbolOffset` incorrectly marked as optional. [#14693](https://github.com/apache/echarts/pull/14693) ([villebro](https://github.com/villebro))
## v5.1.0
<div class="time">2021-04-15</div>
diff --git a/zh/changelog.md b/zh/changelog.md
index d6e8a3e..00740ac 100644
--- a/zh/changelog.md
+++ b/zh/changelog.md
@@ -1,3 +1,12 @@
+## v5.1.1
+<div class="time">2021-04-27</div>
++ [Fix] [geo] 修复 5.1.0 引入的`geo`组件上`tooltip`无法显示的问题。 [#14767](https://github.com/apache/echarts/issues/14767) ([pissang](https://github.com/pissang))
++ [Fix] [tooltip] 修复 5.1.0 引入的 tooltip 在开启 `appendToBody` 后位置不对的问题。 [#14713](https://github.com/apache/echarts/issues/14713) ([plainheart](https://github.com/plainheart))
++ [Fix] [map] 修复 5.1.0 引入的地图上的`tooltip`可能会报错的问题。 [#14704](https://github.com/apache/echarts/issues/14704) ([plainheart](https://github.com/plainheart))
++ [Fix] [pie] 修复饼图上标签引导线`labelLine`从`outside`修改为`inside`之后高亮依然可能显示的问题。 [#14702](https://github.com/apache/echarts/issues/14702) ([villebro](https://github.com/villebro))
++ [Fix] [type] 修复 5.1.0 引入的老版本 TypeScript 可能出现类型错误的问题。 Close [#14716](https://github.com/apache/echarts/issues/14716) [#14739](https://github.com/apache/echarts/issues/14739)
++ [Fix] [type] 修复 `symbolOffset` 非可选的类型错误。 [#14693](https://github.com/apache/echarts/pull/14693) ([villebro](https://github.com/villebro))
+
## v5.1.0
<div class="time">2021-04-15</div>
