-The `alt` parameter is optional. The `size` parameter is also optional,
-defaulting to full size.
+You can also pass `alt`, `title`, `class` and `id` parameters. These are
+passed through unchanged to the html img tag. If you include a `caption`
+parameter, the caption will be displayed centered beneath the image.
+
+The `link` parameter is used to control whether the scaled down image links
+to the full size version. By default it does; set "link=somepage" to link
+to another page instead, or "link=no" to disable the link, or
+"link=http://url" to link to a given url.
+
+You can also set default values that will be applied to all later images on
+the page, unless overridden. Useful when including many images on a page.
+
+ \[[!img defaults size=200x200 alt="wedding photo"]]
+ \[[!img photo1.jpg]]
+ \[[!img photo2.jpg]]
+ \[[!img photo3.jpg size=200x600]]