diff --git a/htdocs/theme/custom.css.php b/htdocs/theme/custom.css.php
index 8caf1696f2f..a26d0a1e1bb 100644
--- a/htdocs/theme/custom.css.php
+++ b/htdocs/theme/custom.css.php
@@ -31,5 +31,5 @@ if (empty($dolibarr_nocache)) {
 }
 
 
-print '// Here, the content of the common custom CSS defined into Home - Setup - Display - CSS'."\n";
+print '/* Here, the content of the common custom CSS defined into Home - Setup - Display - CSS'."*/\n";
 print getDolGlobalString('MAIN_IHM_CUSTOM_CSS');