Mention the possibility to add other backend support.

README.md

@@ -6,11 +6,17 @@ functionnalities.
 
 ## Follow link
 
-Using `xwidget-plus-follow-link` uses `ivy` to choose a link on the current web
+Using `xwidget-plus-follow-link` to choose a link on the current web
 page. It also highlight the candidates on the web page.
 
 ![Imgur](https://i.imgur.com/1KO70FE.gif)
 
+It currently uses `ivy` for completion because it provides an easy way to hook
+into the candidate selection process (`update-fn`). I'm willing to add support
+for other completion backend, open an issue with your backend of choice and I'll
+have a look at what can be done. Or better, fork and create a pull request, most
+of the needed code is already there, it just needs to be hooked.
+
 ## Switch to xwidget on browse
 
 When opening a url using `xwidget-webkit` in an already opened session that is