fix syntax
diff --git a/en/option/partial/universal-transition.md b/en/option/partial/universal-transition.md
index 4588d68..66dd454 100644
--- a/en/option/partial/universal-transition.md
+++ b/en/option/partial/universal-transition.md
@@ -15,7 +15,7 @@
Wheather to enable the universal transition animation.
-##${prefix} seriesKey(string | Array)
+##${prefix} seriesKey(string|Array)
The `seriesKey` determines how the series to be animated is associated, it defaults to the `id` of the series when not configured.
diff --git a/zh/option/partial/universal-transition.md b/zh/option/partial/universal-transition.md
index db7eda2..a2ec2a4 100644
--- a/zh/option/partial/universal-transition.md
+++ b/zh/option/partial/universal-transition.md
@@ -15,7 +15,7 @@
是否开启全局过渡动画。
-##${prefix} seriesKey(string | Array)
+##${prefix} seriesKey(string|Array)
`seriesKey`决定了如何关联需要动画的系列，未配置时会默认取系列的`id`。
