diff --git a/fun.go b/fun.go
index 6ffd696..5aabc7f 100644
--- a/fun.go
+++ b/fun.go
@@ -374,7 +374,7 @@ func ontologize(s string) string {
 			p = h[:1]
 			h = h[1:]
 		}
-		return fmt.Sprintf(`%s<a href="https://%s/o/%s">%s</a>`, p, serverName,
+		return fmt.Sprintf(`%s<a class="mention u-url" href="https://%s/o/%s">%s</a>`, p, serverName,
 			strings.ToLower(h[1:]), h)
 	})
 	return s