update description about instance heartbeat
diff --git a/java-chassis-reference/en_US/general-development/visit-sc.md b/java-chassis-reference/en_US/general-development/visit-sc.md
index bc4d5a0..f29f7b8 100755
--- a/java-chassis-reference/en_US/general-development/visit-sc.md
+++ b/java-chassis-reference/en_US/general-development/visit-sc.md
@@ -16,4 +16,4 @@
| servicecomb.service.registry.instance. Watch | true | | No | Whether to monitor instance changes in PUSH mode. When it is false, it means using PULL mode. | |
| servicecomb.service.registry. Autodiscovery | false | | No | Whether to automatically discover the address of the service center. This configuration is enabled when a partial address needs to be configured, and other addresses are discovered by the configured service center instance. | |
| servicecomb.service.registry.instance.healthCheck.interval | 30 | | No | Heartbeat interval. | |
-| servicecomb.service.registry.instance.healthCheck.times | 3 | | No | Number of allowed heartbeat failures. Interval \* times determines when the instance is automatically logged out. If the service center waits for such a long time and does not receive a heartbeat, the instance will be logged off. | |
+| servicecomb.service.registry.instance.healthCheck.times | 3 | | No | Number of allowed heartbeat failures. If there is (times + 1) continuous heartbeat failures, this instance will be automatically logged off by service-center, i.e. interval \* (times + 1) determines when the instance is automatically logged off. If the service center waits for such a long time and does not receive a heartbeat, the instance will be logged off. | |
diff --git a/java-chassis-reference/zh_CN/general-development/visit-sc.md b/java-chassis-reference/zh_CN/general-development/visit-sc.md
index 5c9265a..8e2e9d3 100644
--- a/java-chassis-reference/zh_CN/general-development/visit-sc.md
+++ b/java-chassis-reference/zh_CN/general-development/visit-sc.md
@@ -16,7 +16,4 @@
| servicecomb.service.registry.instance.watch | true | | 否 | 是否采用PUSH模式监听实例变化。为false的时候表示使用PULL模式。 | |
| servicecomb.service.registry.autodiscovery | false | | 否 | 是否自动发现服务中心的地址。当需要配置部分地址，其他地址由配置的服务中心实例发现的时候，开启这个配置。 | |
| servicecomb.service.registry.instance.healthCheck.interval | 30 | | 否 | 心跳间隔。 | |
-| servicecomb.service.registry.instance.healthCheck.times | 3 | | 否 | 允许的心跳失败次数。interval \* times决定了实例被自动注销的时间。如果服务中心等待这么长的时间没有收取到心跳，会注销实例。 | |
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+| servicecomb.service.registry.instance.healthCheck.times | 3 | | 否 | 允许的心跳失败次数。当连续第times+1次心跳仍然失败时则实例被sc下线。即interval \* (times + 1)决定了实例被自动注销的时间。如果服务中心等待这么长的时间没有收取到心跳，会注销实例。 | |
