diff --git a/htdocs/core/lib/website2.lib.php b/htdocs/core/lib/website2.lib.php
index c7099e8d2ed..fb4cfa1b520 100644
--- a/htdocs/core/lib/website2.lib.php
+++ b/htdocs/core/lib/website2.lib.php
@@ -673,10 +673,12 @@ function showWebsiteTemplates(Website $website)
 
 
 /**
- * checkPHPCode
+ * Check a new string containing only php code (including <php tag)
+ * - Block if bad code in the new string.
+ * - Block also if user has no permission to change PHP code.
  *
- * @param	string		$phpfullcodestringold		PHP old string
- * @param	string		$phpfullcodestring			PHP new string
+ * @param	string		$phpfullcodestringold		PHP old string. For exemple "<?php echo 'a' ?><php echo 'b' ?>"
+ * @param	string		$phpfullcodestring			PHP new string. For exemple "<?php echo 'a' ?><php echo 'c' ?>"
  * @return	int										Error or not
  */
 function checkPHPCode($phpfullcodestringold, $phpfullcodestring)