diff --git a/Dev.md b/Dev.md
index fb4b4bc..e29fc5a 100644
--- a/Dev.md
+++ b/Dev.md
@@ -37,6 +37,8 @@ Views into the process of Tahoe-LAFS hackery.
   * [Where does allmydata.client start listening?](https://tahoe-lafs.org/pipermail/tahoe-dev/2013-July/008611.html)
 
 ### Presentations / Papers
+ * [//~zooko/VailComputingElementsWorkshop2013/slides.html slides] presented at “Vail Computing Elements Workshop” in Vail 2013
+ * [//~zooko/Ecrypt2020-Tenerife-InternetCryptoWorkshop/slides.html slides] presented at “ECRYPT II Crypto For 2020” in Tenerife 2013
  * [//trac/tahoe-lafs/attachment/wiki/News/tahoe-RSA-slides.pdf] presented at RSA 2010
  * [//trac/chrome/lafs.pdf Tahoe – The Least-Authority Filesystem] presented at [Storage Security and Survivability '08](http://storagess.org/2008)
  * [//~warner/pycon-tahoe.html Tahoe: A Secure Distributed Filesystem] presented at