diff --git a/NewCapDesign.md b/NewCapDesign.md
index 74b3220..f225da1 100644
--- a/NewCapDesign.md
+++ b/NewCapDesign.md
@@ -6,9 +6,10 @@ 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.
+There will be a related pair of new encoding designs/protocols (or equivalent;
+it has also been suggested that a single protocol could support both mutable and
+immutable files). The [NewImmutableEncodingDesign](NewImmutableEncodingDesign) and [NewMutableEncodingDesign](NewMutableEncodingDesign)
+pages will hold those design discussions.
 
 Ticket #432 was the starting point: it contained a list of features.