diff --git a/Doc.md b/Doc.md
index b0256fa..1a5133e 100644
--- a/Doc.md
+++ b/Doc.md
@@ -7,6 +7,9 @@
  * [using](http://allmydata.org/source/tahoe/trunk/docs/using.html): how to use it once it is running
 
  * [Known Issues]source:docs/known_issues.txt: things you need to be aware of if you want to rely on Tahoe to store your valuable data.
+
+ * [The story of a file](http://bigasterisk.com/tahoe-playground), interactive illustration by Drew Perttula.
+
  * [UseCases](UseCases): the ways in which Tahoe should be useful
  * [InstallDetails](InstallDetails): more information about building and installing Tahoe