diff --git a/NewMutableEncodingDesign.md b/NewMutableEncodingDesign.md
index ddf7cd9..7aee504 100644
--- a/NewMutableEncodingDesign.md
+++ b/NewMutableEncodingDesign.md
@@ -9,6 +9,7 @@ page is about the backend layout that would make those features possible.
  * #308 is about deep-traversal dircaps, which will require support from the
    underlying mutable files
  * [this tahoe-dev message](http://allmydata.org/pipermail/tahoe-dev/2009-July/002345.html) and its neighbors have some good discussion about cap design for mutable files
+ * [The Elk Point design](http://allmydata.org/pipermail/tahoe-dev/2009-September/002848.html) is very interesting, and has not yet been transcribed into this wiki page.
 
 # Yay ECDSA