diff --git a/README.md b/README.md
index c1647fb74cce7d181dab3a0303e2924f44b77def..000b1dc158a3896ff6756d397c42ee28d7801b5d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
-# [pi calculation benchmark](http://fab.cba.mit.edu/classes/864.17/text/benchmark.pdf)
+# pi calculation benchmark
+[http://fab.cba.mit.edu/classes/MAS.864/text/benchmark.pdf](http://fab.cba.mit.edu/classes/864.17/text/benchmark.pdf)
 
 |estimated GFlops|code|description|system|date|
 |---|---|---|---|---|