Add notes on passing alt in query arg when resolving links

content/docs/api/db/obj/url-to/contents.lr

@@ -24,6 +24,10 @@ the path fails, then the path is interpreted as a URL-path, or, if
 If the path starts with a leading bang (``!``) then no resolving is
 performed.  This is equivalent to passing `resolve=False`.
 
+An explicit value for `alt` may be specified via the `alt` parameter to `url_to`.
+Alternatively, an `alt` query arg may be included in the `path` parameter.
+For example, `src.url_to('/', alt='de')` is equivalent to `src.url_to('/?alt=de')` — both return the URL to the root of the site with `alt=de`. 
+
 If no `alt` is provided the `alt` of the page is used.
 
 

content/docs/api/db/types/markdown/contents.lr

@@ -70,3 +70,11 @@ label = Body
 type = markdown
 resolve_links = never
 ```
+
+## Linking to a Specific Alt
+
+When links are resolved through the Lektor database, URLs to specific _alt_s may be obtained by adding an `alt` query arg to the link.
+For example, to link to the current page, but in the German alt:
+```md
+Here is the [French version of the blog](/blog?alt=fr).
+```