diff --git a/Doc.md b/Doc.md
index c687789..d5e903c 100644
--- a/Doc.md
+++ b/Doc.md
@@ -25,6 +25,7 @@ Note: these links are to the 'trunk' (latest) versions of the documentation. See
  * [architecture](http://tahoe-lafs.org/source/tahoe/trunk/docs/architecture.txt): a succinct overview of the whole system 
  * [Command Line Interface](http://tahoe-lafs.org/source/tahoe/trunk/docs/frontends/CLI.txt): the basic "how to" for the CLI
  * [Web API](http://tahoe-lafs.org/source/tahoe/trunk/docs/frontends/webapi.txt): the basic "how to" for the WAPI
+ * [Capabilities](Capabilities) what are capabilities; the different kinds that we currently use
 
 ## Presentations / Papers
  * [Tahoe – The Least-Authority Filesystem](http://tahoe-lafs.org/~zooko/lafs.pdf) presented at [Storage Security and Survivability '08](http://storagess.org/2008)