diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 490b3f4..92040f8 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -27,5 +27,6 @@
         'phpdoc_no_alias_tag' => false, // Allow @link in addition to @see.
         'phpdoc_separation' => false, // Don't put blank line between @params, @throws and @return.
         'phpdoc_summary' => false, // Don't force terminating dot on the first line.
+        'phpdoc_add_missing_param_annotation' => ['only_untyped' => false],
     ])
     ->setFinder($finder);
diff --git a/samples/simple-report.php b/samples/simple-report.php
index b4d8ef1..7d800aa 100644
--- a/samples/simple-report.php
+++ b/samples/simple-report.php
@@ -6,7 +6,7 @@
 
 require ROOT . '/vendor/autoload.php';
 
-$tex = new LatexRenderer(__DIR__, 'pdflatex', true);
+$tex = new LatexRenderer(__DIR__, 'pdflatex', true); // <- debug true - files will not be deleted
 $monolog = new \Monolog\Logger('Tex-Samples', [new \Monolog\Handler\RotatingFileHandler(ROOT . '/runtime/log/sample.log')]);
 $tex->setLogger($monolog);
 $tex->setTmpDir(ROOT . '/runtime/');
@@ -56,4 +56,4 @@
         ],
     ],
 ]);
-echo $pdf !== null ? 'Success' .PHP_EOL : 'Failure' . PHP_EOL;
+echo $pdf !== null ? 'Success' . PHP_EOL : 'Failure' . PHP_EOL;
diff --git a/src/LatexRenderer.php b/src/LatexRenderer.php
index ba2af10..7b26809 100644
--- a/src/LatexRenderer.php
+++ b/src/LatexRenderer.php
@@ -79,7 +79,9 @@ public function setTmpDir(string $tmpDir): void
     }
 
     /**
-     * @param array $files
+     * @param string $templateName
+     * @param array $variables
+     * @param array $files additional files which will be saved to ./files/<name> - format: key=name, value=fileContent
      * @return string|null returns pdf as string or null on failure
      */
     public function renderPdf(string $templateName, array $variables, array $files = []): ?string