diff --git a/test/phpunit/CodingPhpTest.php b/test/phpunit/CodingPhpTest.php
index 159323a9e83..dbd02ffdfc9 100644
--- a/test/phpunit/CodingPhpTest.php
+++ b/test/phpunit/CodingPhpTest.php
@@ -157,6 +157,7 @@ class CodingPhpTest extends PHPUnit_Framework_TestCase
             
             $ok=true;
             $matches=array();
+            // Check string   ='".$this->xxx   with xxx that is not 'escape'. It means we forget a db->escape when forging sql request.
             preg_match_all('/=\s*\'"\s*\.\s*\$this->(....)/', $filecontent, $matches, PREG_SET_ORDER);
             foreach($matches as $key => $val)
             {