diff --git a/src/Spout/Writer/XLSX/Manager/Style/StyleRegistry.php b/src/Spout/Writer/XLSX/Manager/Style/StyleRegistry.php
index 01a852c..3452e47 100644
--- a/src/Spout/Writer/XLSX/Manager/Style/StyleRegistry.php
+++ b/src/Spout/Writer/XLSX/Manager/Style/StyleRegistry.php
@@ -141,6 +141,8 @@ class StyleRegistry extends \Box\Spout\Writer\Common\Manager\Style\StyleRegistry
         $styleId = $style->getId();
 
         $format = $style->getFormat();
+        
+        // If format is passed as array then skip it from add it to rowstyles
         if (!is_array($format)) {
             $isFormatRegistered = isset($this->registeredFormats[$format]);