diff --git a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosDiscoveryProperties.java b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosDiscoveryProperties.java
index 3ee047b4..632448db 100644
--- a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosDiscoveryProperties.java
+++ b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosDiscoveryProperties.java
@@ -183,17 +183,17 @@ public class NacosDiscoveryProperties {
 	private String secretKey;
 
 	/**
-	 * Heart beat interval. Time unit: second.
+	 * Heart beat interval. Time unit: millisecond.
 	 */
 	private Integer heartBeatInterval;
 
 	/**
-	 * Heart beat timeout. Time unit: second.
+	 * Heart beat timeout. Time unit: millisecond.
 	 */
 	private Integer heartBeatTimeout;
 
 	/**
-	 * Ip delete timeout. Time unit: second.
+	 * Ip delete timeout. Time unit: millisecond.
 	 */
 	private Integer ipDeleteTimeout;