diff --git a/HttpServer/Server.php b/HttpServer/Server.php
index d2eca66b..8a632667 100644
--- a/HttpServer/Server.php
+++ b/HttpServer/Server.php
@@ -104,6 +104,7 @@ class Server extends Application
 		if (!$isEnable) {
 			return;
 		}
+		$this->debug('Runtime::enableCoroutine...');
 		Runtime::enableCoroutine(true, SWOOLE_HOOK_TCP |
 			SWOOLE_HOOK_UNIX |
 			SWOOLE_HOOK_UDP |