diff --git a/tools/Requirements-Checker/checker.php b/tools/Requirements-Checker/checker.php
index 46d46e3e53..fa59127def 100644
--- a/tools/Requirements-Checker/checker.php
+++ b/tools/Requirements-Checker/checker.php
@@ -205,6 +205,13 @@
 	'description' => 'Fileinfo extension or function <code>mime_content_type()</code> are absent. You will not be able to determine mime type of uploaded files.',
 );
 
+$tests[] = array(
+	'title' => 'Intl extension',
+	'required' => FALSE,
+	'passed' => class_exists('Transliterator', FALSE),
+	'description' => 'Class Transliterator is absent, the output of Nette\Utils\Strings::webalize() and Nette\Utils\Strings::toAscii() may not be accurate for non-latin alphabets.',
+);
+
 $tests[] = array(
 	'title' => 'HTTP_HOST or SERVER_NAME',
 	'required' => TRUE,