diff --git a/contexts/projects.json b/contexts/projects.json
index f02b701..ad3b84a 100644
--- a/contexts/projects.json
+++ b/contexts/projects.json
@@ -14,6 +14,7 @@
 	"url": {"@id": "@id", "@type": "@id"},
 	"type": {"@id": "@type", "@type": "@id"},
 	"links": {"@id": "dc:link", "@type": "@id"},
-	"nicknames": "xpub:nick"
+	"nicknames": "xpub:nick",
+	"cover": { "@id": "xpub:cover", "@type": "@id" }
     }
 }