diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index a72d2057004..4627a66bbba 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -5694,8 +5694,7 @@ function dol_string_onlythesehtmltags($stringtoclean, $cleanalsosomestyles = 1)
 {
 	$allowed_tags = array(
 		"html", "head", "meta", "body", "article", "a", "abbr", "b", "blockquote", "br", "cite", "div", "dl", "dd", "dt", "em", "font", "img", "ins", "hr", "i", "li", "link",
-		"ol", "p", "q", "s", "section", "span", "strike", "strong", "title",
-		"table", "tr", "th", "td", "u", "ul"
+		"ol", "p", "q", "s", "section", "span", "strike", "strong", "title", "table", "tr", "th", "td", "u", "ul", "sup", "sub", "blockquote", "pre", "h1", "h2", "h3", "h4", "h5", "h6"
 	);
 	$allowed_tags_string = join("><", $allowed_tags);
 	$allowed_tags_string = preg_replace('/^>/', '', $allowed_tags_string);