diff --git a/src/Data/MaskPatternTester.php b/src/Data/MaskPatternTester.php
index ae8972b9a..9accf3cd5 100644
--- a/src/Data/MaskPatternTester.php
+++ b/src/Data/MaskPatternTester.php
@@ -8,6 +8,8 @@
  * @author       Smiley <smiley@chillerlan.net>
  * @copyright    2017 Smiley
  * @license      MIT
+ *
+ * @noinspection PhpUnused
  */
 
 namespace chillerlan\QRCode\Data;
diff --git a/src/Output/QRImage.php b/src/Output/QRImage.php
index f30a87552..eb67a46e5 100644
--- a/src/Output/QRImage.php
+++ b/src/Output/QRImage.php
@@ -8,6 +8,8 @@
  * @author       Smiley <smiley@chillerlan.net>
  * @copyright    2015 Smiley
  * @license      MIT
+ *
+ * @noinspection PhpUnused
  */
 
 namespace chillerlan\QRCode\Output;
diff --git a/src/QRCode.php b/src/QRCode.php
index 12b0a76d3..b736d17f6 100755
--- a/src/QRCode.php
+++ b/src/QRCode.php
@@ -321,6 +321,8 @@ class QRCode{
 
 	/**
 	 * a dummy
+	 *
+	 * @noinspection PhpUnused
 	 */
 	protected function isByte(string $data):bool{
 		return !empty($data);
diff --git a/src/QROptionsTrait.php b/src/QROptionsTrait.php
index 45ee0fe52..f1bc71665 100644
--- a/src/QROptionsTrait.php
+++ b/src/QROptionsTrait.php
@@ -8,6 +8,8 @@
  * @author       smiley <smiley@chillerlan.net>
  * @copyright    2018 smiley
  * @license      MIT
+ *
+ * @noinspection PhpUnused
  */
 
 namespace chillerlan\QRCode;