diff --git a/README.md b/README.md
index e99bc09fc..5332e2c7e 100644
--- a/README.md
+++ b/README.md
@@ -40,13 +40,18 @@ Once suspended, execution of the fiber may be resumed with any value using Fiber
     public static function setInterval(callable $callable, int $interval) : void;
 
     /**
-     * @param array<int, mixed> $options
+     * @param string $url
+     * @param array<string|null, string|array> $options
+     * @return Promise when Promise resolve InternetRequestResult and when Promise reject Error
+     * @throws Throwable
+     * @phpstan-param array{method?: string, headers?: array<int, string>, timeout?: int, body?: array<string, string>} $options
      *
      * This method is used to fetch data from an url.
      */
-    public static function fetch(string $url, array $options = [CURLOPT_RETURNTRANSFER => true]) : Promise;
+    public static function fetch(string $url, array $options = []) : Promise;
 
     /**
+     * @throws Throwable
      * This method is used to fetch data from an url. But it uses file_get_contents() instead of curl.
      */
     public static function fetchJg(string $url) : Promise;