diff --git modules/image/image.module modules/image/image.module
index 4ca0e34..5d7384c 100644
--- modules/image/image.module
+++ modules/image/image.module
@@ -1078,12 +1078,12 @@ function image_effect_apply($image, $effect) {
  *   - path: The path of the image file relative to the Drupal files directory.
  *     This function does not work with images outside the files directory nor
  *     with remotely hosted images.
- *   - alt: The alternative text for text-based browsers.
- *   - title: The title text is displayed when the image is hovered in some
- *     popular browsers.
  *   - attributes: Associative array of attributes to be placed in the img tag.
- *   - getsize: If set to TRUE, the image's dimension are fetched and added as
- *     width/height attributes.
+ *   - alt: (optional) The alternative text for text-based browsers.
+ *   - title: (optional) The title text is displayed when the image is hovered
+ *     in some popular browsers.
+ *   - getsize: (optional) If set to TRUE, the image's dimension are fetched and
+ *     added as width/height attributes.
  *
  * @ingroup themeable
  */