diff --git a/QueryGenerator.php b/QueryGenerator.php
index 286013f..6de752e 100644
--- a/QueryGenerator.php
+++ b/QueryGenerator.php
@@ -273,10 +273,10 @@ public function __construct(
     * @method limit(): self
     * @method offset(): self
     * @method as(): self
-    * @method duplicate(): self
-    * @method modify(): self
+    * @method duplicate(string $query, string $args): self
+    * @method modify(string $modifier): self
     * @method forupdate(): self
-    * @seal-methods
+    * @psalm-seal-methods
     */
    public function __call(string $method, array $args) {
       $method = strtolower($method);