diff --git a/asis-ctf-quals-2014/serial-number/README.md b/asis-ctf-quals-2014/serial-number/README.md
index 44d2d617..6ef5b4df 100644
--- a/asis-ctf-quals-2014/serial-number/README.md
+++ b/asis-ctf-quals-2014/serial-number/README.md
@@ -12,4 +12,4 @@
 
 ## Other write-ups
 
-* none yet
+* <http://blog.ztrix.me/blog/2014/05/10/asis-quals-2014-serial-number-writeup/>