diff --git a/docs/en/api/options.md b/docs/en/api/options.md
index 4b07cca5e..20e57e1ec 100644
--- a/docs/en/api/options.md
+++ b/docs/en/api/options.md
@@ -172,6 +172,8 @@ Pass properties for components to use in injection. See [provide/inject](https:/
 - type: `boolean`
 - default: `true`
 
+Sets all watchers to run synchronously.
+
 When `sync` is `true`, the Vue component is rendered synchronously.  
 When `sync` is `false`, the Vue component is rendered asynchronously.
 
diff --git a/docs/zh-cn/api/options.md b/docs/zh-cn/api/options.md
index 6841567f1..f9c2de6b1 100644
--- a/docs/zh-cn/api/options.md
+++ b/docs/zh-cn/api/options.md
@@ -13,6 +13,7 @@
 - [`attrs`](#attrs)
 - [`listeners`](#listeners)
 - [`provide`](#provide)
+- [`sync`](#sync)
 
 ### `context`
 
@@ -166,6 +167,13 @@ expect(wrapper.vm.$route).toBeInstanceOf(Object)
 
 为组件传递用于注入的属性。可查阅 [provie/inject](https://cn.vuejs.org/v2/api/#provide-inject) 了解更多。
 
+### `sync`
+
+- 类型：`boolean`
+- 默认值：`true`
+
+将所有的侦听器都设置为同步执行。
+
 ## 其它选项
 
 当 `mount` 和 `shallow` 的选项包含了挂载选项之外的选项时，则会将它们通过[扩展](https://vuejs.org/v2/api/#extends)覆写到其组件选项。