diff --git a/pkg/rpc/protos/service_http_cache_task.proto b/pkg/rpc/protos/service_http_cache_task.proto
index 42b31c5..26d6502 100644
--- a/pkg/rpc/protos/service_http_cache_task.proto
+++ b/pkg/rpc/protos/service_http_cache_task.proto
@@ -32,9 +32,9 @@ service HTTPCacheTaskService {
 
 // 创建任务
 message CreateHTTPCacheTaskRequest {
-	string type = 1;
-	string keyType = 2;
-	repeated string keys = 3;
+	string type = 1; // 类型：清理：purge，预热：fetch
+	string keyType = 2; // Key类型：单个URL：key，目录：prefix；预热的时候只能为 key
+	repeated string keys = 3; // 要清理的Key
 }
 
 message CreateHTTPCacheTaskResponse {