diff --git a/src/functions.php b/src/functions.php
index afb0c797..d5332475 100644
--- a/src/functions.php
+++ b/src/functions.php
@@ -12,7 +12,7 @@
  *
  * @template T
  *
- * @param \Closure():T $closure
+ * @param \Closure(...):T $closure
  * @param mixed ...$args Arguments forwarded to the closure when starting the fiber.
  *
  * @return Future<T>