diff --git a/NewCapDesign.md b/NewCapDesign.md
index 74daddb..02a3b21 100644
--- a/NewCapDesign.md
+++ b/NewCapDesign.md
@@ -6,6 +6,9 @@ across separate tickets: this page is here to consolidate them. We should not
 release a new filecap format without checking it against everything on this
 list.
 
+There will be a related pair of new encoding designs. The [NewImmutableEncodingDesign](NewImmutableEncodingDesign)
+and [NewMutableEncodingDesign](NewMutableEncodingDesign) pages will hold those design discussions.
+
 Ticket #432 was the starting point: it contained a list of features.
 
 ## make them real URIs