diff --git a/wchat/common/HttpClient.php b/wchat/common/HttpClient.php
index 16843d4..48fadc1 100644
--- a/wchat/common/HttpClient.php
+++ b/wchat/common/HttpClient.php
@@ -329,7 +329,7 @@ class HttpClient
 	}
 
 	/**
-	 * @param $string
+	 * @param string $_string
 	 * @return bool|string
 	 * @throws Exception
 	 */