Documentation updates for lektor/lektor#1102

content/docs/api/templates/filters/markdown/contents.lr

@@ -20,3 +20,13 @@ the [Markdown Type :ref](../../../db/types/markdown/).
   {{ "Hello **World**"|markdown }}
 </div>
 ```
+
+## Controlling URL Resolution
+
+By default, an attempt is made to resolve relative URLs in markdown *links* and *image* tags to a *record* through the Lektor database.
+This makes things “just work” when linking to images and other attachments from pages that have a non-default  [alt :ref](/docs/content/alts/),
+as well as in other edge cases e.g. involving custom [slug_formats :ref](/docs/models/children/#child-slug-behavior).
+
+This behavior can be controlled by passing an optional `resolve_links` parameter to the filter.
+This works like the  [resolve_links :ref](/docs/api/db/types/markdown/#resolution-of-links) option of the *Markdown field type*.
+