diff --git a/extension.neon b/extension.neon
index c8c147f..d8bd73a 100644
--- a/extension.neon
+++ b/extension.neon
@@ -18,6 +18,7 @@ parameters:
 		- stubs/Forms/Container.stub
 		- stubs/Forms/Form.stub
 		- stubs/Forms/Rules.stub
+		- stubs/HtmlStringable.stub
 		- stubs/Http/SessionSection.stub
 		- stubs/Routing/Router.stub
 		- stubs/Utils/ArrayHash.stub
diff --git a/stubs/HtmlStringable.stub b/stubs/HtmlStringable.stub
new file mode 100644
index 0000000..17cf7c7
--- /dev/null
+++ b/stubs/HtmlStringable.stub
@@ -0,0 +1,10 @@
+<?php
+
+namespace Nette;
+
+interface HtmlStringable
+{
+
+	public function __toString(): string;
+
+}
diff --git a/stubs/Utils/Html.stub b/stubs/Utils/Html.stub
index 1ee2b50..b4983de 100644
--- a/stubs/Utils/Html.stub
+++ b/stubs/Utils/Html.stub
@@ -2,6 +2,8 @@
 
 namespace Nette\Utils;
 
+use Nette\HtmlStringable;
+
 /**
  * @implements \IteratorAggregate<int, self|string>
  * @implements \ArrayAccess<int, self|string>
@@ -17,4 +19,12 @@ class Html implements \ArrayAccess, \IteratorAggregate
 		// nothing
 	}
 
+	/**
+	 * @param string|HtmlStringable $child
+	 */
+	final public function addHtml(mixed $child): static
+	{
+		// nothing
+	}
+
 }