diff --git a/src/Forms/Controls/BaseControl.php b/src/Forms/Controls/BaseControl.php
index 2f9de2a27..fea926708 100644
--- a/src/Forms/Controls/BaseControl.php
+++ b/src/Forms/Controls/BaseControl.php
@@ -132,7 +132,7 @@ public function loadHttpData(): void
 
 	/**
 	 * Loads HTTP data.
-	 * @return mixed
+	 * @return string|string[]
 	 */
 	protected function getHttpData($type, ?string $htmlTail = null)
 	{
diff --git a/src/Forms/Form.php b/src/Forms/Form.php
index 833d993b3..94129c366 100644
--- a/src/Forms/Form.php
+++ b/src/Forms/Form.php
@@ -417,7 +417,7 @@ public function setSubmittedBy(?SubmitterControl $by)
 
 	/**
 	 * Returns submitted HTTP data.
-	 * @return mixed
+	 * @return string|string[]
 	 */
 	public function getHttpData(?int $type = null, ?string $htmlName = null)
 	{