diff --git a/README.md b/README.md
index 737338f..7b68e49 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ numbers on the dominoes are different kinds of moonstones, and the goal is to
 collect all the dominoes by sliding matching numbers next to each other. There
 are two safe ways a domino can move.
 
-[pdf]: http://donkirkby.github.com/moonside.pdf
+[pdf]: http://donkirkby.github.com/moonside/moonside.pdf
 
 ### Matching ###
 Move a domino one space along its long axis so that it ends up with at least