diff --git a/doc/design/external_special_remote_protocol.mdwn b/doc/design/external_special_remote_protocol.mdwn
index aab93ab081..1c582591bb 100644
--- a/doc/design/external_special_remote_protocol.mdwn
+++ b/doc/design/external_special_remote_protocol.mdwn
@@ -214,3 +214,5 @@ remote.
 * uuid verification during PREPARE (so, for example, it can check if a
   removable drive repo has the expected uuid)
 * Support for splitting files into chunks.
+* Support for getting and setting the list of urls that can be associated
+  with a key.