diff --git a/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/ans/AnsProperties.java b/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/ans/AnsProperties.java
index 587ed0c6..1952a524 100644
--- a/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/ans/AnsProperties.java
+++ b/spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/ans/AnsProperties.java
@@ -94,7 +94,7 @@ public class AnsProperties implements AnsConfiguration {
 	private String clientCluster = "DEFAULT";
 
 	/**
-	 * Unsupported.
+	 * Temporarily not supported, reserved fields.
 	 */
 	private Map<String, String> clientMetadata = new HashMap<>();