--- extlink.module
+++ extlink.module
@@ -43,7 +43,13 @@ function extlink_admin_settings() {
     '#title' => t('Add icon to external links'),
     '#return_value' => 'ext',
     '#default_value' => variable_get('extlink_class', 'ext'),
-    '#description' => t('Places an !icon icon next to external links.', array('!icon' => theme_image(drupal_get_path('module', 'extlink') .'/extlink.png'))),
+    '#description' => t('Places an !icon icon next to external links.', array(
+      '!icon' => theme_image(array(
+        'path' => drupal_get_path('module', 'extlink') .'/extlink.png',
+        'alt' => t('External Links icon'),
+        'attributes' => '',
+      )),
+    )),
   );
 
   $form['extlink_mailto_class'] = array(
@@ -51,7 +57,13 @@ function extlink_admin_settings() {
     '#title' => t('Add icon to mailto links'),
     '#return_value' => 'mailto',
     '#default_value' => variable_get('extlink_mailto_class', 'mailto'),
-    '#description' => t('Places an !icon icon next to mailto links.', array('!icon' => theme_image(drupal_get_path('module', 'extlink') .'/mailto.png'))),
+    '#description' => t('Places an !icon icon next to mailto links.', array(
+      '!icon' => theme_image(array(
+        'path' => drupal_get_path('module', 'extlink') . '/mailto.png',
+        'alt' => t('Email links icon'),
+        'attributes' => '',
+      )),
+    )),
   );
 
   $form['extlink_subdomains'] = array(