add web anno selectors info to Selectors registry

Author: kirschbombe

source/_includes/links.md

@@ -200,6 +200,7 @@
 [org-w3c-webanno]: http://w3.org/TR/annotation-model/ "Web Annotation Model"
 [org-w3c-webanno-motivation]: https://www.w3.org/TR/annotation-model/#motivation-and-purpose "Web Annotation Model - Motivation"
 [org-w3c-webanno-TextQuoteSelector]: https://www.w3.org/TR/annotation-model/#text-quote-selector "Web Annotation Model - Text Quote Selector"
+[org-w3c-webanno-Selectors]: https://www.w3.org/TR/annotation-model/#selectors "Web Annotation model - Selectors"
 [org-w3c-webarch]: http://www.w3.org/TR/webarch/ "Architecture of the World Wide Web"
 [org-w3c-xsd-datetime]: https://www.w3.org/TR/xmlschema11-2/#dateTime "XSD DateTime"
 [org-wsgi-pep333]: https://www.python.org/dev/peps/pep-0333/ "PEP 0333"

source/registry/selectors/index.md

@@ -42,7 +42,9 @@ Changes will be tracked within the document.
 
 Selectors in Annotations are used to describe how to retrieve a given part of a resource. They are then associated with an instance of `SpecificResource` that also references the resource of which the Specific Resource is part.
 
-The Selectors described here extend the use of the [Web Annotation][org-w3c-webanno] model within the IIIF APIs, and were previously applied to the predecessor of the Web Annotation model, Open Annotation. These Selectors can be used with either annotation model.
+The Selectors described here extend the use of the [Web Annotation][org-w3c-webanno] model within the IIIF APIs, and were previously applied to the predecessor of the Web Annotation model, Open Annotation. These Selectors can be used with either annotation model. 
+
+IIIF also supports the use of Web Annotation model Selectors, such as `FragmentSelector`. For more information on these Selectors, see the [IIIF Presentation API][prezi-api] and the [Web Annotation Selectors documentation][org-w3c-webanno-Selectors].
 
 ## 2. Selector Classes