diff --git a/TahoeTwo.md b/TahoeTwo.md
index 72d3a93..9076484 100644
--- a/TahoeTwo.md
+++ b/TahoeTwo.md
@@ -2,7 +2,7 @@ Copied from (@@http://tahoebs1.allmydata.com:8123/file/URI%3ACHK%3Ayhw67uwzcdszq
 
 # THIS PAGE DESCRIBES HISTORICAL DESIGN CHOICES.
 
-See <http://allmydata.org/source/tahoe/trunk/docs/architecture.txt> for current documentation.
+See <http://allmydata.org/source/tahoe/trunk/docs/architecture.rst> for current documentation.
 
 When a file is uploaded, the encoded shares are sent to other peers. But to
 which ones? The [PeerSelection](PeerSelection) algorithm is used to make this choice.