diff --git a/lam/lib/html.inc b/lam/lib/html.inc
index 8bbe5ddb..bc99f90a 100644
--- a/lam/lib/html.inc
+++ b/lam/lib/html.inc
@@ -3628,7 +3628,7 @@ class htmlResponsiveRow extends htmlElement {
* Adds the content as a typical field with 12/6/6 columns and CSS class "responsiveField".
*
* @param htmlElement $content field
- * @param $cssClasses CSS class names separated by space
+ * @param string $cssClasses CSS class names separated by space
*/
public function addField($content, $cssClasses = '') {
$this->add($content, 12, 6, 6, 'responsiveField ' . $cssClasses);