Makes the specified page depend on the specified [[ikiwiki/PageSpec]].
-Additional named parameters can be passed, to indicate what type of
-dependency this is.
-
-Currently, only a "content" parameter is specified. If set to 0, the
-dependency does not involve the content of pages matching the PageSpec, but
-only their existence.
+By default, dependencies are full content dependencies, meaning that the
+page will be updated whenever anything matching the PageSpec is modified.
+This default can be overridden by additional named parameters, which can be
+used to indicate weaker types of dependencies:
+
+* `presence` if set to true, only the presence of a matching page triggers
+ the dependency.
+* `links` if set to true, any change to links on a matching page
+ triggers the dependency. This includes when a link is added, removed,
+ or changes what it points to due to other changes. It does not include
+ the addition or removal of a duplicate link.
#### `pagespec_match($$;@)`