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+Options +FollowSymLinks
+RewriteEngine on
+AddType text/turtle .owl
+RewriteRule ^ https://raw.githubusercontent.com/wilkinsonlab/ORCA-X/master/orca-x.owl [R=303,L]
diff --git a/orca-x/README.md b/orca-x/README.md
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+## Redirect for the ORCA-X
+
+ORCA-X is a set of extensions to the ORCA Ontology
+hosted at http://vocab.deri.ie/orca
+
+It creates several new subclasses by OWL2 punning of entities that 
+are modelled as Individuals in the original ontology.  It also adds 4 new 
+subclasses of "CertaintyLevel" that reflect the categories 
+identified in the Prieto & Wilkinson certainty survey study 
+(publication pending)
+
+maintainer of this w3id:  Mark D Wilkinson:  mark.wilkinson@upm.es