Diff being reverted:
diff --git a/cnc/index.mdwn b/cnc/index.mdwn
index 418f874..41a123d 100644
--- a/cnc/index.mdwn
+++ b/cnc/index.mdwn
@@ -86,6 +86,6 @@ some overhead.
 Then, I set up the initial outputs, and the direction registers. No
 movement should occur yet.
 
-[01-setup.c](01-setup.c)
+[01-setup.c](01-setup.c.html)