diff --git a/Doc.md b/Doc.md
index f1703b6..4846d9b 100644
--- a/Doc.md
+++ b/Doc.md
@@ -8,7 +8,7 @@ Note: these links are to the 'trunk' (latest) versions of the documentation. See
  * [running](http://tahoe-lafs.org/source/tahoe/trunk/docs/running.html): how to run it once it is set up
 
 
- * [Known Issues]source:docs/known_issues.txt: things you need to be aware of if you want to rely on Tahoe-LAFS to store your valuable data.
+ * [Known Issues]source:docs/known_issues.rst: things you need to be aware of if you want to rely on Tahoe-LAFS to store your valuable data.
  * [How To Report A Bug](HowToReportABug): We love bug reports! Here's how.
 
  * [The story of a file](http://bigasterisk.com/tahoe-playground), interactive illustration by Drew Perttula.